Swap preview pane actions.

Cleaned up tests and lint errors.
Upgraded npm packages.

bump.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+latest=$(git describe --tags --abbrev=0 2>/dev/null || echo "v0.0.0")
+IFS='.' read -r major minor patch <<< "${latest#v}"
+
+case ${1:-patch} in
+    major) new="v$((major+1)).0.0" ;;
+    minor) new="v${major}.$((minor+1)).0" ;;
+    patch) new="v${major}.${minor}.$((patch+1))" ;;
+    *) echo "Usage: bump.sh [major|minor|patch]" >&2; exit 1 ;;
+esac
+
+git tag -a "$new"
+

c2p

@@ -0,0 +1 @@
+code2prompt -c -e package-lock.json -e example.json -e "colorlib/*"

colorlib/src/color.rs

@@ -167,6 +167,21 @@ impl Color {
             Component::HCL_L => Color::from_hcl(self.hcl.h, self.hcl.c, value),
         }
     }
+
+    /// Checks if two Color objects are equal
+    ///
+    /// # Example:
+    ///
+    /// ```
+    /// use colorlib::Color;
+    ///
+    /// let color1 = Color::from_hex("FF0000");
+    /// let color2 = Color::from_hex("FF0000");
+    /// assert!(color1.equals(&color2));
+    /// ```
+    pub fn equals(&self, other: &Color) -> bool {
+        self == other
+    }
 }
 
 #[cfg(test)]
@@ -252,8 +267,7 @@ mod tests {
         fn color_from_hcl() {
             let hex_code = "4B964B";
             let (hr, hg, hb) = (75u8, 150u8, 75u8);
-            let (r, g, b) =
-                (75.19744022437494, 150.3948804487499, 75.19744022437494);
+            let (r, g, b) = (75.19744022437494, 150.3948804487499, 75.19744022437494);
             let (h1, s, v) = (120.0, 0.5, 0.5897838448970584);
             let (h2, c, l) = (120.0, 0.5, 0.49);
 

colorlib/src/color/hcl.rs

@@ -85,6 +85,21 @@ impl HCL {
         let c = calc::chroma(h, s, l);
         HCL::new(h, c, l)
     }
+
+    /// Checks if two HCL colors are equal
+    ///
+    /// # Example:
+    ///
+    /// ```
+    /// use colorlib::hcl::HCL;
+    ///
+    /// let hcl1 = HCL::new(0.0, 1.0, 0.55);
+    /// let hcl2 = HCL::new(0.0, 1.0, 0.55);
+    /// assert!(hcl1.equals(&hcl2));
+    /// ```
+    pub fn equals(&self, other: &HCL) -> bool {
+        self == other
+    }
 }
 
 #[cfg(test)]
@@ -185,15 +200,7 @@ mod tests {
             0.864996,
             0.521301
         );
-        from_hsv!(
-            from_hsv_dark_magenta,
-            300.0,
-            0.9,
-            0.5,
-            300.0,
-            0.9,
-            0.323601
-        );
+        from_hsv!(from_hsv_dark_magenta, 300.0, 0.9, 0.5, 300.0, 0.9, 0.323601);
         from_hsv!(
             from_hsv_light_magenta,
             300.0,

colorlib/src/color/hex.rs

@@ -138,6 +138,21 @@ impl Hex {
             b: decoded[2],
         }
     }
+
+    /// Checks if two Hex colors are equal
+    ///
+    /// # Example:
+    ///
+    /// ```
+    /// use colorlib::hex::Hex;
+    ///
+    /// let hex1 = Hex::from_code("FF0000");
+    /// let hex2 = Hex::from_code("FF0000");
+    /// assert!(hex1.equals(&hex2));
+    /// ```
+    pub fn equals(&self, other: &Hex) -> bool {
+        self == other
+    }
 }
 
 #[cfg(test)]

colorlib/src/color/hsv.rs

@@ -114,6 +114,21 @@ impl HSV {
         let v = calc::value(h, s, l);
         HSV::new(h, s, v)
     }
+
+    /// Checks if two HSV colors are equal
+    ///
+    /// # Example:
+    ///
+    /// ```
+    /// use colorlib::hsv::HSV;
+    ///
+    /// let hsv1 = HSV::new(0.0, 1.0, 1.0);
+    /// let hsv2 = HSV::new(0.0, 1.0, 1.0);
+    /// assert!(hsv1.equals(&hsv2));
+    /// ```
+    pub fn equals(&self, other: &HSV) -> bool {
+        self == other
+    }
 }
 
 #[cfg(test)]

colorlib/src/color/rgb.rs

@@ -93,6 +93,21 @@ impl RGB {
         let hsv = HSV::from_hcl(h, c, l);
         RGB::from_hsv(hsv.h, hsv.s, hsv.v)
     }
+
+    /// Checks if two RGB colors are equal
+    ///
+    /// # Example:
+    ///
+    /// ```
+    /// use colorlib::rgb::RGB;
+    ///
+    /// let rgb1 = RGB::new(255.0, 0.0, 0.0);
+    /// let rgb2 = RGB::new(255.0, 0.0, 0.0);
+    /// assert!(rgb1.equals(&rgb2));
+    /// ```
+    pub fn equals(&self, other: &RGB) -> bool {
+        self == other
+    }
 }
 
 #[cfg(test)]

cypress/support/commands.ts

@@ -36,7 +36,10 @@
 //   }
 // }
 
-Cypress.Commands.add("dataCy", (value: string) => {
+Cypress.Commands.add("dataCy", (value: string, noTimeout?: boolean) => {
+  if (noTimeout) {
+    return cy.get(`[data-cy="${value}"]`, { timeout: 0 });
+  }
   return cy.get(`[data-cy="${value}"]`);
 });
 

cypress/support/component-index.html

@@ -5,6 +5,13 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width,initial-scale=1.0" />
     <title>Components App</title>
+    <style>
+      body {
+        font-family:
+          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
+          Arial, sans-serif;
+      }
+    </style>
   </head>
   <body>
     <div data-cy-root></div>

eslint.config.js

@@ -24,6 +24,7 @@ export default tseslint.config(
         "warn",
         { allowConstantExport: true },
       ],
+      "react-hooks/exhaustive-deps": "off",
     },
   },
 );

generate_tag.sh

@@ -1,2 +0,0 @@
-#!/bin/bash
-git tag -a "$(cat VERSION)" -m "Version $(cat VERSION)"

package.json

@@ -7,21 +7,22 @@
     "build:wasm": "wasm-pack build colorlib -t bundler -d pkg --release",
     "check": "tsc --noEmit -p tsconfig.app.json",
     "clean": "rm -rf dist colorlib/pkg*",
+    "cypress:component": "cypress run --component",
     "cypress:open": "1>/dev/null 2>/dev/null cypress open -d &",
     "dev": "vite",
     "lint": "eslint .",
     "preview": "vite preview",
     "test:wasm": "cargo test --lib --manifest-path colorlib/Cargo.toml",
     "test:wasmdoc": "cargo test --doc --manifest-path colorlib/Cargo.toml",
-    "test": "vitest",
-    "test:component:chrome": "cypress run --component -b chromium",
-    "test:component:fire": "cypress run --component -b firefox"
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:component": "cypress run --component -b chromium",
+    "test:component:fire": "cypress run --component -b firefox",
+    "test:e2e": "cypress run --e2e -b chromium",
+    "test:e2e:firefox": "cypress run --e2e -b firefox"
   },
   "dependencies": {
-    "@fortawesome/fontawesome-svg-core": "^7.0.0",
-    "@fortawesome/free-regular-svg-icons": "^7.0.0",
-    "@fortawesome/free-solid-svg-icons": "^7.0.0",
-    "@fortawesome/react-fontawesome": "^0.2.3",
+    "lucide-react": "^0.542.0",
     "motion": "^12.23.12",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"

src/App.module.css

@@ -1,30 +1,36 @@
+.background {
+  width: 100%;
+  min-height: 100%;
+  display: flex;
+}
+
 .appWrapper {
-  background-color: white;
-  height: 100%;
+  background-color: #f9f9f9;
+  min-height: 100%;
   width: 1200px;
   margin: 0 auto;
   box-shadow: 0 0 40px #7a7a7a;
-  border-left: 2px solid #7a7a7a;
-  border-right: 2px solid #7a7a7a;
-  overflow: hidden;
+  border-left: 1px solid #c9c9c9;
+  border-right: 1px solid #c9c9c9;
 }
 
 .mainLayout {
+  height: 100%;
   height: 100%;
   display: grid;
   grid-template-areas:
     "header header"
     "picker palette";
+  grid-template-rows: auto 1fr;
   grid-template-columns: 1fr 2fr;
-  grid-template-rows: 76px 1fr;
 }
 
 .appHeader {
   grid-area: header;
   display: flex;
-  align-items: baseline;
-  border-bottom: 2px solid #7a7a7a;
-  padding: 20px 30px 12px;
+  align-items: center;
+  border-bottom: 1px solid #c9c9c9;
+  padding: 20px 30px 22px;
 }
 
 .appHeader .title {
@@ -52,38 +58,41 @@
   grid-area: picker;
   display: flex;
   flex-direction: column;
-  border-right: 2px solid #7a7a7a;
+  border-right: 1px solid #c9c9c9;
 }
 
 .secondZone {
   min-width: 0;
   grid-area: palette;
-  color: #555;
-  font-style: italic;
+  display: flex;
+  flex-direction: column;
 }
 
 .colorHistoryWrapper {
+  flex-shrink: 0;
   box-sizing: border-box;
-  border-bottom: 2px solid #7a7a7a;
+  border-bottom: 1px solid #c9c9c9;
   position: relative;
 }
 
 .colorPickerWrapper {
-  border-bottom: 2px solid #7a7a7a;
-  padding: 20px 40px 40px;
+  border-bottom: 1px solid #c9c9c9;
+  padding: 20px 40px 26px;
 }
 
 .colorValuesWrapper {
-  padding: 40px;
-}
-
-.colorHistoryWrapper {
+  padding: 24px 40px;
 }
 
 .paletteEditorWrapper {
+  flex: 2;
+  min-height: 0;
+  overflow-y: hidden;
+  border-bottom: 1px solid #c9c9c9;
 }
 
 .paletteLibraryWrapper {
+  flex: 1;
 }
 
 /* Large */

src/App.tsx

@@ -1,199 +1,70 @@
-import { useState } from "react";
+import { useMemo } from "react";
 
-import clsx from "clsx";
 import { Color } from "colorlib";
 
 import ColorHistory from "@/components/ColorHistory/ColorHistory";
 import ColorPicker from "@/components/ColorPicker/ColorPicker";
 import ColorValues from "@/components/ColorValues/ColorValues";
-import { LeftMenu, RightMenu } from "@/components/SideMenu";
-import { useMediaQuery } from "@/providers/hooks";
 import { useSelectedColor } from "@/providers/hooks";
 
 import styles from "./App.module.css";
+import PaletteEditor from "./components/PaletteEditor/PaletteEditor";
+import { deserializeCard, loadActiveCardId, loadCards } from "./hooks/storage";
 import { formatCssRgb } from "./util";
 
-// Menu Button Components
+function App() {
+  const lum = 0.75;
+  const chr = 0.8;
+  const steps = 8;
 
-interface MenuButtonProps {
-  onClick: () => void;
-  isOpen: boolean;
-}
-
-function LeftMenuButton({ onClick, isOpen }: MenuButtonProps) {
-  return (
-    <button
-      className={styles.leftMenuButton}
-      onClick={onClick}
-      aria-label="Open left menu"
-      aria-haspopup="dialog"
-      aria-expanded={isOpen}
-    >
-      ☰
-    </button>
+  const colors = useMemo(
+    () =>
+      Array.from({ length: steps }, (_, index) => {
+        const hue = (index * 360) / (steps - 1);
+        return Color.from_hcl(hue, chr, lum);
+      }),
+    [],
   );
-}
 
-function RightMenuButton({ onClick, isOpen }: MenuButtonProps) {
-  return (
-    <button
-      className={styles.rightMenuButton}
-      onClick={onClick}
-      aria-label="Open right menu"
-      aria-haspopup="dialog"
-      aria-expanded={isOpen}
-    >
-      ☰
-    </button>
+  const colorGradient = useMemo(
+    () =>
+      colors
+        .map((color, index) => {
+          const colorString = formatCssRgb(color.hex);
+          const percentage = (index / (colors.length - 1)) * 100;
+          return `${colorString} ${percentage}%`;
+        })
+        .join(", "),
+    [],
   );
-}
-
-// Mobile Layout Components
-
-interface MenuStateProps {
-  isRightMenuOpen: boolean;
-  isLeftMenuOpen: boolean;
-  setIsRightMenuOpen: (state: boolean) => void;
-  setIsLeftMenuOpen: (state: boolean) => void;
-}
-
-function MobileTopNav({
-  onLeftMenuClick,
-  onRightMenuClick,
-  isRightMenuOpen,
-  isLeftMenuOpen,
-}: {
-  onLeftMenuClick: () => void;
-  onRightMenuClick: () => void;
-  isRightMenuOpen: boolean;
-  isLeftMenuOpen: boolean;
-}) {
-  return (
-    <nav className={styles.mobileTopNav} aria-label="Mobile top navigation">
-      <LeftMenuButton onClick={onLeftMenuClick} isOpen={isLeftMenuOpen} />
-      <RightMenuButton onClick={onRightMenuClick} isOpen={isRightMenuOpen} />
-    </nav>
-  );
-}
-
-function MobileLeftNav({ onClick, isOpen }: MenuButtonProps) {
-  return (
-    <nav className={styles.mobileLeftNav} aria-label="Mobile left navigation">
-      <LeftMenuButton onClick={onClick} isOpen={isOpen} />
-    </nav>
-  );
-}
-
-function MobileRightNav({ onClick, isOpen }: MenuButtonProps) {
-  return (
-    <nav className={styles.mobileRightNav} aria-label="Mobile right navigation">
-      <RightMenuButton onClick={onClick} isOpen={isOpen} />
-    </nav>
-  );
-}
-
-function MobileFirstZone() {
-  const { selectedColor, selectedColorActions } = useSelectedColor();
 
   return (
-    <section className={styles.mobileFirstZone} aria-label="Color tools">
     <div
-        className={styles.tabWrapper}
-        role="region"
-        aria-roledescription="carousel"
-        aria-label="Swipe left or right to view different tools"
+      className={styles.background}
+      style={{
+        background: `linear-gradient(180deg, ${colorGradient})`,
+      }}
     >
-        <div
-          className={clsx(styles.tab, styles.colorPickerWrapper)}
-          role="group"
-          aria-roledescription="slide"
-          aria-label="Color Picker"
-        >
-          <ColorPicker color={selectedColor} actions={selectedColorActions} />
-        </div>
-        <div
-          className={clsx(styles.tab, styles.colorValuesWrapper)}
-          role="group"
-          aria-roledescription="slide"
-          aria-label="Color values"
-        >
-          <ColorValues color={selectedColor} actions={selectedColorActions} />
+      <div className={styles.appWrapper} role="application">
+        <DesktopContent />
       </div>
     </div>
-    </section>
   );
 }
 
-function MobileSecondZone() {
+function DesktopContent() {
   return (
-    <section className={styles.mobileSecondZone} aria-label="Palette tools">
-      <div
-        className={styles.paletteEditorWrapper}
-        aria-label="Palette editor"
-      ></div>
-    </section>
+    <div className={styles.mainLayout}>
+      <header className={styles.appHeader}>
+        <span className={styles.title}>LUMINANCE</span>
+        <span className={styles.subtitle}>A color picker for humans.</span>
+      </header>
+      <FirstZone />
+      <SecondZone />
+    </div>
   );
 }
 
-function MobileContent({
-  isLeftMenuOpen,
-  setIsLeftMenuOpen,
-  isRightMenuOpen,
-  setIsRightMenuOpen,
-}: MenuStateProps) {
-  const toggleRightMenu = () => setIsRightMenuOpen(!isRightMenuOpen);
-  const toggleLeftMenu = () => setIsLeftMenuOpen(!isLeftMenuOpen);
-  const { isMobilePortrait, isMobileLandscape } = useMediaQuery();
-
-  return (
-    <main className={styles.mobileContent}>
-      {isMobilePortrait && (
-        <MobileTopNav
-          onLeftMenuClick={toggleLeftMenu}
-          onRightMenuClick={toggleRightMenu}
-          isLeftMenuOpen={isLeftMenuOpen}
-          isRightMenuOpen={isRightMenuOpen}
-        />
-      )}
-
-      {isMobileLandscape && (
-        <MobileLeftNav onClick={toggleLeftMenu} isOpen={isLeftMenuOpen} />
-      )}
-
-      <MobileFirstZone />
-      <MobileSecondZone />
-
-      {isMobileLandscape && (
-        <MobileRightNav onClick={toggleRightMenu} isOpen={isRightMenuOpen} />
-      )}
-
-      <LeftMenu
-        isOpen={isLeftMenuOpen}
-        onClose={() => setIsLeftMenuOpen(false)}
-      >
-        <div id="user-info" aria-label="User information">
-          User Info
-        </div>
-      </LeftMenu>
-
-      <RightMenu
-        isOpen={isRightMenuOpen}
-        onClose={() => setIsRightMenuOpen(false)}
-      >
-        <div
-          id="palette-library"
-          className={styles.paletteLibraryWrapper}
-          aria-label="Palette library"
-        >
-          Palette Library
-        </div>
-      </RightMenu>
-    </main>
-  );
-}
-
-// Desktop Layout Components
-
 function FirstZone() {
   const { selectedColor, selectedColorActions } = useSelectedColor();
 
@@ -212,6 +83,16 @@ function FirstZone() {
 function SecondZone() {
   const { selectedColor, selectedColorActions } = useSelectedColor();
 
+  const initialCardState = useMemo(() => {
+    const id = loadActiveCardId();
+    const cards = loadCards();
+    const saved = id ? cards[id] : null;
+    console.log(id, cards);
+    return saved
+      ? { present: deserializeCard(saved), history: [], future: [] }
+      : undefined;
+  }, []);
+
   return (
     <section className={styles.secondZone} aria-label="Palette tools">
       <div className={styles.colorHistoryWrapper} aria-label="Color History">
@@ -221,10 +102,13 @@ function SecondZone() {
           disabled={false}
         />
       </div>
-      <div
-        className={styles.paletteEditorWrapper}
-        aria-label="Palette editor"
-      ></div>
+      <div className={styles.paletteEditorWrapper} aria-label="Palette editor">
+        <PaletteEditor
+          pickerColor={selectedColor.hex}
+          setPickerColor={selectedColorActions.hex.setHex}
+          initialCardState={initialCardState}
+        />
+      </div>
       <div
         className={styles.paletteLibraryWrapper}
         aria-label="Palette library"
@@ -233,67 +117,4 @@ function SecondZone() {
   );
 }
 
-function DesktopContent() {
-  return (
-    <div className={styles.mainLayout}>
-      <header className={styles.appHeader}>
-        <span className={styles.title}>LUMINANCE</span>
-        <span className={styles.subtitle}>A color picker for humans.</span>
-      </header>
-      <FirstZone />
-      <SecondZone />
-    </div>
-  );
-}
-
-// Main App Component
-
-function App() {
-  const [isRightMenuOpen, setIsRightMenuOpen] = useState(false);
-  const [isLeftMenuOpen, setIsLeftMenuOpen] = useState(false);
-  // const { isDesktop } = useMediaQuery();
-  const isDesktop = true;
-
-  const lum = 0.75;
-  const chr = 0.8;
-  const steps = 8;
-
-  const colors = Array.from({ length: steps }, (_, index) => {
-    const hue = (index * 360) / (steps - 1);
-    return Color.from_hcl(hue, chr, lum);
-  });
-
-  const colorGradient = colors
-    .map((color, index) => {
-      const colorString = formatCssRgb(color.hex);
-      const percentage = (index / (colors.length - 1)) * 100;
-      return `${colorString} ${percentage}%`;
-    })
-    .join(", ");
-
-  return (
-    <div
-      className={styles.background}
-      style={{
-        width: "100%",
-        height: "100%",
-        background: `linear-gradient(180deg, ${colorGradient})`,
-      }}
-    >
-      <div className={styles.appWrapper} role="application">
-        {!isDesktop && (
-          <MobileContent
-            isLeftMenuOpen={isLeftMenuOpen}
-            setIsLeftMenuOpen={setIsLeftMenuOpen}
-            isRightMenuOpen={isRightMenuOpen}
-            setIsRightMenuOpen={setIsRightMenuOpen}
-          />
-        )}
-
-        {isDesktop && <DesktopContent />}
-      </div>
-    </div>
-  );
-}
-
 export default App;

src/components/ColorHistory/ColorHistory.module.css

@@ -4,7 +4,7 @@
   flex-wrap: nowrap;
   overflow-x: auto;
   width: 100%;
-  padding: 5px 0px 0px;
+  padding: 10px 0px 0px;
 
   /* Improve scrolling experience */
   -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
@@ -17,32 +17,36 @@
   height: 50px;
   width: 25px;
   margin: 5px;
-  border: 2px solid #7a7a7a;
-  transition:
-    margin 200ms,
-    height 200ms,
-    width 200ms;
+  border: 1px solid #7a7a7a;
+  background-color: transparent;
   cursor: pointer;
-}
-
-.historyColor:hover {
-  height: 56px;
-  width: 31px;
-  margin: 2px;
-}
-
-.historyColor:first-of-type:hover {
-  margin-left: 12px;
+  transition:
+    box-shadow 150ms ease-out,
+    transform 150ms ease-out;
+  box-shadow:
+    rgba(60, 64, 67, 0.25) 0px 1px 2px 0px,
+    rgba(60, 64, 67, 0.1) 0px 1px 3px 0px;
 }
 
 .historyColor:first-of-type {
   margin-left: 15px;
 }
 
-.historyColor:last-of-type:hover {
-  margin-right: 12px;
-}
-
 .historyColor:last-of-type {
   margin-right: 15px;
 }
+
+.historyColor:hover {
+  transform: translateY(-0.5px);
+  box-shadow:
+    rgba(60, 64, 67, 0.3) 0px 2px 6px 0px,
+    rgba(60, 64, 67, 0.15) 0px 3px 8px 2px;
+}
+
+.historyColor:active {
+  transform: translateY(0.5px);
+  box-shadow:
+    rgba(60, 64, 67, 0.2) 0px 0px 1px 0px,
+    inset 0px 1px 2px rgba(0, 0, 0, 0.2);
+  transition-duration: 50ms;
+}

src/components/ColorHistory/ColorHistory.test.cy.tsx

@@ -53,10 +53,11 @@ describe("color history", () => {
     cy.enableTransitions();
   });
 
-  it("adds stable color values after 1 second", () => {
+  it("adds stable color values after 3 seconds", () => {
     // add stable values to history
-    cy.dataCy("hex-value-input").as("value").clear().type("#00F536");
-    cy.tick(1000);
+    cy.dataCy("hex-value-input").as("value").clear().type("#00F536").blur();
+    cy.wait(0); // let blur take effect
+    cy.tick(3000);
 
     cy.dataCy("color-history").children().should("have.length", 1);
     cy.dataCy("history-color-0").should(
@@ -65,8 +66,9 @@ describe("color history", () => {
       "rgb(0, 245, 54)",
     );
 
-    cy.get("@value").clear().type("#E23AEC");
-    cy.tick(1000);
+    cy.get("@value").clear().type("#E23AEC").blur();
+    cy.wait(0);
+    cy.tick(3000);
 
     cy.dataCy("color-history").children().should("have.length", 2);
     cy.dataCy("history-color-0").should(
@@ -81,14 +83,15 @@ describe("color history", () => {
 
     // disable history
     cy.dataCy("disabled-checkbox").click();
-    cy.get("@value").clear().type("#00C3EE");
-    cy.tick(1000);
+    cy.get("@value").clear().type("#00C3EE").blur();
+    cy.wait(0);
+    cy.tick(3000);
 
     cy.dataCy("color-history").children().should("have.length", 2);
 
     // re-enable history
     cy.dataCy("disabled-checkbox").click();
-    cy.tick(1000);
+    cy.tick(3000);
 
     cy.dataCy("color-history").children().should("have.length", 3);
   });

src/components/ColorHistory/ColorHistory.tsx

@@ -18,6 +18,7 @@ function ColorHistory({
   disabled: boolean;
 }) {
   const [history, setHistory] = useState<Color[]>([]);
+  const colorValue = color.hex.to_code();
   const maxItems = 50;
 
   useEffect(() => {
@@ -31,10 +32,10 @@ function ColorHistory({
         const newHistory = [color, ...prev];
         return newHistory.slice(0, maxItems);
       });
-    }, 1000);
+    }, 2000);
 
     return () => clearTimeout(timer);
-  }, [color, disabled]);
+  }, [colorValue, disabled]);
 
   const handleClick = (historyColor: Color) => {
     setColor(historyColor);

src/components/ColorPicker/ColorBar.tsx

@@ -6,7 +6,7 @@ import { memory } from "colorlib/colorlib_bg.wasm";
 import { useSmoothAnimation } from "@/hooks/animation";
 import type { Setter } from "@/hooks/color";
 import { useSlider } from "@/hooks/slider";
-import { useResize } from "@/hooks/window";
+import { onResize } from "@/hooks/window";
 import type { CartesianSpace } from "@/types";
 import { Direction } from "@/types";
 import { setMeasurements } from "@/util";
@@ -27,17 +27,21 @@ function ColorBar({
   parentDimensions: CartesianSpace;
 }) {
   // State
-  const [colorBar, setColorBar] = useState<colorlib.ColorBar | null>(null);
   const [origin, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
 
   // Refs
   const containerRef = useRef<HTMLDivElement>(null);
   const canvasRef = useRef<HTMLCanvasElement>(null);
+  const colorBarRef = useRef<colorlib.ColorBar | null>(null);
 
   // Hooks
   const smoothAnimation = useSmoothAnimation();
 
+  // Dimensions
+  const barWidth = parentDimensions.x > 0 ? parentDimensions.x - 54 : 0;
+  const barHeight = containerRef.current?.clientHeight;
+
   // Slider interaction
   const { sliderRef } = useSlider({
     direction: Direction.HORIZONTAL,
@@ -50,13 +54,14 @@ function ColorBar({
 
   // Update canvas when hue/luminance changes
   useEffect(() => {
-    if (colorBar && canvasRef.current) {
+    const bar = colorBarRef.current;
+    if (bar && canvasRef.current) {
       smoothAnimation(() => {
-        colorBar.fill_color(hue, luminance);
-        refreshColorBar(canvasRef.current!, colorBar);
+        bar.fill_color(hue, luminance);
+        refreshColorBar(canvasRef.current!, bar);
       });
     }
-  }, [hue, luminance, colorBar]);
+  }, [hue, luminance]);
 
   // Get measurements
   useEffect(() => {
@@ -64,30 +69,38 @@ function ColorBar({
       setMeasurements(containerRef, setOrigin, setDimensions);
     }
 
-    return useResize(() =>
+    return onResize(() =>
       setMeasurements(containerRef, setOrigin, setDimensions),
     );
-  }, [containerRef.current]);
+  }, [containerRef]);
 
   // Resize color bar
   useEffect(() => {
-    if (containerRef.current && canvasRef.current && parentDimensions.x > 0) {
+    if (!containerRef.current || !canvasRef.current || parentDimensions.x <= 0)
+      return;
+
+    colorBarRef.current?.free();
+
     const newHeight = containerRef.current.clientHeight;
     const newWidth = parentDimensions.x - 54;
-      const newColorBar = new colorlib.ColorBar(newWidth, newHeight);
+    const bar = new colorlib.ColorBar(newWidth, newHeight);
+    colorBarRef.current = bar;
 
-      setColorBar(newColorBar);
-
-      if (newColorBar) {
     smoothAnimation(() => {
       if (canvasRef.current) {
-            newColorBar.fill_color(hue, luminance);
-            refreshColorBar(canvasRef.current!, newColorBar);
+        bar.fill_color(hue, luminance);
+        refreshColorBar(canvasRef.current!, bar);
       }
     });
-      }
-    }
-  }, [containerRef.current, canvasRef.current, parentDimensions]);
+  }, [parentDimensions]);
+
+  // free on unmount
+  useEffect(() => {
+    return () => {
+      colorBarRef.current?.free();
+      colorBarRef.current = null;
+    };
+  }, []);
 
   return (
     <div className={styles.colorBarWrapper} ref={containerRef}>
@@ -95,15 +108,11 @@ function ColorBar({
         className={styles.colorBar}
         ref={sliderRef}
         style={{
-          width: colorBar?.get_width(),
-          height: colorBar?.get_height(),
+          width: barWidth,
+          height: barHeight,
         }}
       >
-        <canvas
-          ref={canvasRef}
-          width={colorBar?.get_width()}
-          height={colorBar?.get_height()}
-        />
+        <canvas ref={canvasRef} width={barWidth} height={barHeight} />
       </div>
     </div>
   );

src/components/ColorPicker/ColorPicker.module.css

@@ -1,9 +1,8 @@
 .container {
   display: grid;
   grid-template-columns: 25px 1fr 25px;
-  grid-template-rows: 50px 1fr 25px;
+  grid-template-rows: 1fr 25px;
   grid-template-areas:
-    ". preview ."
     "leftGrip square rightGrip"
     ". bottomGrip ."
     ". bar .";
@@ -13,14 +12,20 @@
   grid-area: preview;
   height: 25px;
   margin-bottom: 15px;
-  border: 2px solid #7a7a7a;
+  border: 1px solid #7a7a7a;
+  box-shadow:
+    rgba(0, 0, 0, 0.16) 0px 3px 6px,
+    rgba(0, 0, 0, 0.23) 0px 3px 6px;
 }
 
 .pickerSquare {
   grid-area: square;
   position: relative;
   aspect-ratio: 1/1;
-  border: 2px solid #7a7a7a;
+  border: 1px solid #7a7a7a;
+  box-shadow:
+    rgba(0, 0, 0, 0.16) 0px 3px 6px,
+    rgba(0, 0, 0, 0.23) 0px 3px 6px;
 }
 
 .pickerBar {
@@ -28,7 +33,49 @@
   position: relative;
   height: 25px;
   margin-top: 15px;
-  border: 2px solid #7a7a7a;
+  border: 1px solid #7a7a7a;
+  box-shadow:
+    rgba(0, 0, 0, 0.16) 0px 3px 6px,
+    rgba(0, 0, 0, 0.23) 0px 3px 6px;
+}
+
+/* Grips */
+.gripSlider {
+  position: relative;
+  width: 100%;
+  height: 100%;
+}
+
+.grip {
+  position: absolute;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: #e7e7e7;
+  border: 1px solid #c9c9c9;
+  border-radius: 4px;
+  color: #8b8b8b;
+  transition:
+    background-color 150ms,
+    box-shadow 150ms;
+  box-shadow:
+    rgba(0, 0, 0, 0.12) 0px 2px 4px,
+    rgba(0, 0, 0, 0.2) 0px 2px 4px;
+}
+
+.horizontalGrip .grip {
+  height: 20px;
+  width: 32px;
+}
+
+.verticalGripLeft .grip,
+.verticalGripRight .grip {
+  height: 32px;
+  width: 22px;
+}
+
+.horizontalGrip {
+  grid-area: bottomGrip;
 }
 
 .verticalGripLeft {
@@ -39,10 +86,6 @@
   grid-area: rightGrip;
 }
 
-.horizontalGrip {
-  grid-area: bottomGrip;
-}
-
 /* Color Square */
 .colorSquareWrapper {
   height: 100%;
@@ -94,16 +137,3 @@
     box-shadow 400ms;
   pointer-events: none;
 }
-
-/* Square Grips */
-.gripSlider {
-  position: relative;
-  width: 100%;
-  height: 100%;
-}
-
-.grip {
-  position: absolute;
-  width: 0;
-  height: 0;
-}

src/components/ColorPicker/ColorPicker.tsx

@@ -3,10 +3,10 @@ import { useEffect, useRef, useState } from "react";
 import * as colorlib from "colorlib";
 
 import type { ColorActions } from "@/hooks/color";
-import { useResize } from "@/hooks/window";
+import { onResize } from "@/hooks/window";
 import { Direction } from "@/types";
 import type { CartesianSpace } from "@/types";
-import { formatCssRgb, setMeasurements } from "@/util";
+import { setMeasurements } from "@/util";
 
 import ColorBar from "./ColorBar";
 import styles from "./ColorPicker.module.css";
@@ -25,7 +25,7 @@ function ColorPicker({
   const hueRange = { min: 0, max: 359 };
   const lumRange = { min: 0, max: 1 };
 
-  const [_origin, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
+  const [, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
 
   // Get measurements
@@ -34,26 +34,20 @@ function ColorPicker({
       setMeasurements(containerRef, setOrigin, setDimensions);
     }
 
-    return useResize(() => {
+    return onResize(() => {
       setMeasurements(containerRef, setOrigin, setDimensions);
     });
-  }, [containerRef.current]);
+  }, []);
 
   return (
     <div className={styles.container} ref={containerRef}>
-      <div
-        className={styles.preview}
-        style={{
-          backgroundColor: formatCssRgb(color.hex),
-        }}
-      ></div>
       <div className={styles.verticalGripLeft}>
         <GripSlider
           direction={Direction.VERTICAL}
           value={color.hcl.l}
           setValue={actions.hcl.setL}
           valueRange={lumRange}
-          arrowDirection="right"
+          position="left"
           invert={true}
           parentDimensions={dimensions}
         />
@@ -77,7 +71,7 @@ function ColorPicker({
           value={color.hcl.l}
           setValue={actions.hcl.setL}
           valueRange={lumRange}
-          arrowDirection="left"
+          position="right"
           invert={true}
           parentDimensions={dimensions}
         />
@@ -88,7 +82,7 @@ function ColorPicker({
           value={color.hcl.h}
           setValue={actions.hcl.setH}
           valueRange={hueRange}
-          arrowDirection="up"
+          position="bottom"
           parentDimensions={dimensions}
         />
       </div>

src/components/ColorPicker/ColorSquare.tsx

@@ -7,7 +7,7 @@ import { useSmoothAnimation } from "@/hooks/animation";
 import type { HCLColorActions } from "@/hooks/color";
 import { useCrosshair } from "@/hooks/crosshair";
 import { useScroll } from "@/hooks/scroll";
-import { useResize } from "@/hooks/window";
+import { onResize } from "@/hooks/window";
 import type { CartesianSpace } from "@/types";
 import { setMeasurements } from "@/util";
 
@@ -23,15 +23,13 @@ function ColorSquare({
   parentDimensions: CartesianSpace;
 }) {
   // State
-  const [colorSquare, setColorSquare] = useState<colorlib.ColorSquare | null>(
-    null,
-  );
   const [origin, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
 
   // Refs
   const containerRef = useRef<HTMLDivElement>(null);
   const canvasRef = useRef<HTMLCanvasElement>(null);
+  const colorSquareRef = useRef<colorlib.ColorSquare | null>(null);
 
   // Hooks
   const smoothAnimation = useSmoothAnimation();
@@ -56,18 +54,19 @@ function ColorSquare({
 
   // Update canvas when chroma changes
   useEffect(() => {
-    if (colorSquare && canvasRef.current) {
+    const square = colorSquareRef.current;
+    if (square && canvasRef.current) {
       smoothAnimation(() => {
-        colorSquare.fill_chroma(chroma);
-        refreshColorSquare(canvasRef.current!, colorSquare);
+        square.fill_chroma(chroma);
+        refreshColorSquare(canvasRef.current!, square);
       });
     }
-  }, [chroma, colorSquare]);
+  }, [chroma]);
 
   // Add event listeners
   useEffect(() => {
     if (canvasRef.current) addScrollListener();
-  }, []);
+  }, [addScrollListener]);
 
   // Get measurements
   useEffect(() => {
@@ -75,29 +74,37 @@ function ColorSquare({
       setMeasurements(containerRef, setOrigin, setDimensions);
     }
 
-    return useResize(() =>
+    return onResize(() =>
       setMeasurements(containerRef, setOrigin, setDimensions),
     );
-  }, [containerRef.current, parentDimensions]);
+  }, [parentDimensions]);
 
   // Resize square
   useEffect(() => {
-    if (containerRef.current && canvasRef.current && parentDimensions.x > 0) {
+    if (!containerRef.current || !canvasRef.current || parentDimensions.x <= 0)
+      return;
+
+    colorSquareRef.current?.free();
+
     const newSize = parentDimensions.x - 54;
-      const newColorSquare = new colorlib.ColorSquare(newSize);
+    const square = new colorlib.ColorSquare(newSize);
+    colorSquareRef.current = square;
 
-      setColorSquare(newColorSquare);
-
-      if (newColorSquare) {
     smoothAnimation(() => {
       if (canvasRef.current) {
-            newColorSquare.fill_chroma(chroma);
-            refreshColorSquare(canvasRef.current, newColorSquare);
+        square.fill_chroma(chroma);
+        refreshColorSquare(canvasRef.current, square);
       }
     });
-      }
-    }
-  }, [containerRef.current, canvasRef.current, parentDimensions]);
+  }, [containerRef, canvasRef, parentDimensions]);
+
+  // free on unmount
+  useEffect(() => {
+    return () => {
+      colorSquareRef.current?.free();
+      colorSquareRef.current = null;
+    };
+  }, []);
 
   return (
     <div className={styles.colorSquareWrapper} ref={containerRef}>
@@ -105,14 +112,14 @@ function ColorSquare({
         className={styles.colorSquare}
         ref={crosshairRef}
         style={{
-          width: colorSquare?.get_size(),
-          height: colorSquare?.get_size(),
+          width: colorSquareRef.current?.get_size(),
+          height: colorSquareRef.current?.get_size(),
         }}
       >
         <canvas
           ref={canvasRef}
-          width={colorSquare?.get_size()}
-          height={colorSquare?.get_size()}
+          width={colorSquareRef.current?.get_size()}
+          height={colorSquareRef.current?.get_size()}
         />
       </div>
     </div>

src/components/ColorPicker/Crosshair.tsx

@@ -2,7 +2,8 @@ import { useEffect, useRef, useState } from "react";
 
 import * as colorlib from "colorlib";
 
-import { useResize } from "@/hooks/window";
+import { useContrastToken } from "@/hooks/contrast";
+import { onResize } from "@/hooks/window";
 import type { CartesianSpace } from "@/types";
 import { formatCssRgb, setMeasurements, valueToPosition } from "@/util";
 
@@ -19,23 +20,20 @@ export function SquareCrosshair({
   hex: colorlib.Hex;
   parentDimensions: CartesianSpace;
 }) {
-  const [_origin, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
+  const [, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
-  const [darkCrosshairs, setDarkCrosshairs] = useState(true);
+  const crosshairColor = { dark: "black", light: "white" };
+  const token = useContrastToken(() => luminance);
   const containerRef = useRef<HTMLDivElement>(null);
   const lumRange = { min: 0, max: 1 };
   const hueRange = { min: 0, max: 359 };
 
-  useEffect(() => {
-    setDarkCrosshairs(luminance > 0.5);
-  }, [luminance]);
-
   useEffect(() => {
     setMeasurements(containerRef, setOrigin, setDimensions);
-    return useResize(() =>
+    return onResize(() =>
       setMeasurements(containerRef, setOrigin, setDimensions),
     );
-  }, [containerRef.current, parentDimensions]);
+  }, [containerRef, parentDimensions]);
 
   return (
     <div className={styles.crosshairWrapper} ref={containerRef}>
@@ -44,8 +42,8 @@ export function SquareCrosshair({
         style={{
           width: 1,
           height: dimensions.y,
-          backgroundColor: darkCrosshairs ? "black" : "white",
-          boxShadow: darkCrosshairs ? "0 0 2px black" : "0 0 2px white",
+          backgroundColor: crosshairColor[token],
+          boxShadow: `0 0 2px ${crosshairColor[token]}`,
           left: valueToPosition(hue, dimensions.x - 1, hueRange),
           top: 0,
         }}
@@ -55,8 +53,8 @@ export function SquareCrosshair({
         style={{
           width: dimensions.x,
           height: 1,
-          backgroundColor: darkCrosshairs ? "black" : "white",
-          boxShadow: darkCrosshairs ? "0 0 2px black" : "0 0 2px white",
+          backgroundColor: crosshairColor[token],
+          boxShadow: `0 0 2px ${crosshairColor[token]}`,
           left: 0,
           top: valueToPosition(1 - luminance, dimensions.y - 1, lumRange),
         }}
@@ -64,8 +62,8 @@ export function SquareCrosshair({
       <div
         className={styles.crossEye}
         style={{
-          borderColor: darkCrosshairs ? "black" : "white",
-          boxShadow: darkCrosshairs ? "0 0 1px black" : "0 0 1px white",
+          borderColor: crosshairColor[token],
+          boxShadow: `0 0 1px ${crosshairColor[token]}`,
           backgroundColor: formatCssRgb(hex),
           top: valueToPosition(1 - luminance, dimensions.y - 1, lumRange) - 6,
           left: valueToPosition(hue, dimensions.x - 1, hueRange) - 6,
@@ -86,22 +84,19 @@ export function BarCrosshair({
   hex: colorlib.Hex;
   parentDimensions: CartesianSpace;
 }) {
-  const [_origin, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
+  const [, setOrigin] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
-  const [darkCrosshairs, setDarkCrosshairs] = useState(true);
+  const crosshairColor = { dark: "black", light: "white" };
+  const token = useContrastToken(() => luminance);
   const containerRef = useRef<HTMLDivElement>(null);
   const chromaRange = { min: 0, max: 1 };
 
-  useEffect(() => {
-    setDarkCrosshairs(luminance > 0.5);
-  }, [luminance]);
-
   useEffect(() => {
     setMeasurements(containerRef, setOrigin, setDimensions);
-    return useResize(() =>
+    return onResize(() =>
       setMeasurements(containerRef, setOrigin, setDimensions),
     );
-  }, [containerRef.current, parentDimensions]);
+  }, [containerRef, parentDimensions]);
 
   return (
     <div className={styles.crosshairWrapper} ref={containerRef}>
@@ -110,8 +105,8 @@ export function BarCrosshair({
         style={{
           width: 1,
           height: dimensions.y,
-          backgroundColor: darkCrosshairs ? "black" : "white",
-          boxShadow: darkCrosshairs ? "0 0 2px black" : "0 0 2px white",
+          backgroundColor: crosshairColor[token],
+          boxShadow: `0 0 2px ${crosshairColor[token]}`,
           left: valueToPosition(chroma, dimensions.x - 1, chromaRange),
           top: 0,
         }}
@@ -119,8 +114,8 @@ export function BarCrosshair({
       <div
         className={styles.crossEye}
         style={{
-          borderColor: darkCrosshairs ? "black" : "white",
-          boxShadow: darkCrosshairs ? "0 0 1px black" : "0 0 1px white",
+          borderColor: crosshairColor[token],
+          boxShadow: `0 0 1px ${crosshairColor[token]}`,
           backgroundColor: formatCssRgb(hex),
           top: 6,
           left: valueToPosition(chroma, dimensions.x - 1, chromaRange) - 6,

src/components/ColorPicker/GripSlider.tsx

@@ -1,8 +1,10 @@
 import { useEffect, useState } from "react";
 
+import { GripHorizontal, GripVertical } from "lucide-react";
+
 import type { Setter } from "@/hooks/color";
 import { useSlider } from "@/hooks/slider";
-import { useResize } from "@/hooks/window";
+import { onResize } from "@/hooks/window";
 import { Direction } from "@/types";
 import type { CartesianSpace, Range } from "@/types";
 import {
@@ -18,7 +20,7 @@ function GripSlider({
   value,
   setValue,
   valueRange,
-  arrowDirection,
+  position,
   invert = false,
   parentDimensions,
 }: {
@@ -26,7 +28,7 @@ function GripSlider({
   value: number;
   setValue: Setter;
   valueRange: Range;
-  arrowDirection: "up" | "left" | "right";
+  position: "bottom" | "right" | "left";
   invert?: boolean;
   parentDimensions: CartesianSpace;
 }) {
@@ -49,53 +51,21 @@ function GripSlider({
       setMeasurements(sliderRef, setOrigin, setDimensions);
     }
 
-    return useResize(() =>
-      setMeasurements(sliderRef, setOrigin, setDimensions),
-    );
-  }, [sliderRef.current, parentDimensions]);
+    return onResize(() => setMeasurements(sliderRef, setOrigin, setDimensions));
+  }, [sliderRef, parentDimensions]);
 
-  const upArrowStyle = {
-    borderLeft: "12px solid transparent",
-    borderRight: "12px solid transparent",
-    borderBottom: "25px solid black",
-  };
-
-  const leftArrowStyle = {
-    borderTop: "12px solid transparent",
-    borderBottom: "12px solid transparent",
-    borderRight: "25px solid black",
-  };
-
-  const rightArrowStyle = {
-    borderTop: "12px solid transparent",
-    borderBottom: "12px solid transparent",
-    borderLeft: "25px solid black",
-  };
-
-  const arrowStyle = (function () {
-    switch (arrowDirection) {
-      case "up":
-        return upArrowStyle;
-      case "left":
-        return leftArrowStyle;
-      case "right":
-        return rightArrowStyle;
-      default:
-        return {};
-    }
-  })();
+  const isVertical = direction === Direction.VERTICAL;
 
   return (
     <div className={styles.gripSlider} ref={sliderRef}>
       <div
         className={styles.grip}
         style={{
-          ...arrowStyle,
           cursor: isDragging ? "grabbing" : "grab",
           top: chooseValueByDirection(
             direction,
-            0,
-            -12 +
+            6,
+            -17 +
               valueToPosition(
                 valueRange.max - value,
                 dimensions.y - 1,
@@ -104,11 +74,24 @@ function GripSlider({
           ),
           left: chooseValueByDirection(
             direction,
-            -12 + valueToPosition(value, dimensions.x - 1, valueRange),
-            0,
+            -16 + valueToPosition(value, dimensions.x - 1, valueRange),
+            (() => {
+              if (position === "right") {
+                return 6;
+              } else if (position === "left") {
+                return -4;
+              }
+              return 0;
+            })(),
           ),
         }}
-      />
+      >
+        {isVertical ? (
+          <GripVertical size={24} strokeWidth={3} />
+        ) : (
+          <GripHorizontal size={24} strokeWidth={3} />
+        )}
+      </div>
     </div>
   );
 }

src/components/ColorValues/ColorValues.module.css

@@ -11,7 +11,12 @@
   max-height: 94px;
   flex: 1;
   min-height: 0;
-  border: 2px solid #7a7a7a;
+  background-color: #f7f7f7;
+  border: 1px solid #c9c9c9;
+  border-radius: 4px;
+  box-shadow:
+    rgba(0, 0, 0, 0.1) 0px 2px 4px,
+    rgba(0, 0, 0, 0.15) 0px 2px 4px;
 }
 
 .componentWrapper {
@@ -22,7 +27,6 @@
   min-height: 0;
   font-family: monospace;
   border-top: 1px solid #7a7a7a;
-  border-bottom: 1px solid #7a7a7a;
 }
 
 .componentWrapper:first-of-type {
@@ -37,7 +41,7 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  border-right: 2px solid #7a7a7a;
+  border-right: 1px solid #7a7a7a;
 }
 
 .section:last-of-type {
@@ -65,7 +69,7 @@
   top: 0;
   left: 0;
   height: 100%;
-  background-color: #aaa;
+  background-color: #c1c1c1;
   pointer-events: none;
 }
 
@@ -74,6 +78,9 @@
 }
 
 .button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
   height: 100%;
   width: 100%;
   padding: 0;
@@ -81,6 +88,9 @@
   user-select: none;
   background: none;
   border: none;
+  transition-property: background-color;
+  transition-duration: 150ms;
+  transition-timing-function: ease-out;
 }
 
 .button:hover {
@@ -111,9 +121,14 @@
   display: flex;
   align-items: stretch;
   font-family: monospace;
-  border: 2px solid #7a7a7a;
+  background-color: #f7f7f7;
+  border: 1px solid #c9c9c9;
+  border-radius: 4px;
   height: 25px;
   max-width: 150px;
+  box-shadow:
+    rgba(0, 0, 0, 0.1) 0px 2px 4px,
+    rgba(0, 0, 0, 0.15) 0px 2px 4px;
 }
 
 .hexLabel {

src/components/ColorValues/ColorValues.tsx

@@ -45,6 +45,11 @@ function ColorValues({
 
   return (
     <div className={styles.colorValuesWrapper} ref={wrapperRef}>
+      <HexEditor
+        color={color.hex}
+        actions={actions.hex}
+        onKeyDown={handleKeyDown}
+      />
       <SpaceEditor
         space="HCL"
         color={color.hcl}
@@ -63,11 +68,6 @@ function ColorValues({
         actions={actions.rgb}
         onKeyDown={handleKeyDown}
       />
-      <HexEditor
-        color={color.hex}
-        actions={actions.hex}
-        onKeyDown={handleKeyDown}
-      />
     </div>
   );
 }

src/components/ColorValues/HexEditor.test.cy.tsx

@@ -49,11 +49,12 @@ describe("hex editor tests", () => {
     cy.get("@color").should("have.text", "000000");
 
     cy.get("@value").blur();
-    cy.get("@value").should("have.value", "#000000");
+    cy.get("@value").should("have.value", "#000");
     cy.get("@color").should("have.text", "000000");
 
     // Type a new value
-    cy.get("@value").focus().type("{backspace}");
+    cy.get("@value").focus();
+    cy.get("@value").type("{backspace}");
     cy.get("@value").should("have.value", "");
     cy.get("@color").should("have.text", "000000");
 
@@ -62,11 +63,11 @@ describe("hex editor tests", () => {
     cy.get("@color").should("have.text", "000000");
 
     cy.get("@value").type("c");
-    cy.get("@value").should("have.value", "#ABC");
-    cy.get("@color").should("have.text", "AABBCC");
+    cy.get("@value").should("have.value", "abc");
+    cy.get("@color").should("have.text", "000000");
 
     cy.get("@value").blur();
-    cy.get("@value").should("have.value", "#AABBCC");
+    cy.get("@value").should("have.value", "#ABC");
     cy.get("@color").should("have.text", "AABBCC");
 
     // Invalid blur resets to last valid color

src/components/ColorValues/SpaceEditor.test.cy.tsx

@@ -102,8 +102,8 @@ describe("space editor tests", () => {
     });
 
     cy.dataCy("rgb-value").should("have.text", "RGB (16, 75, 74)");
-    cy.dataCy("hsv-value").should("have.text", "HSV (178, 0.78, 0.29)");
-    cy.dataCy("hcl-value").should("have.text", "HCL (178, 0.78, 0.25)");
+    cy.dataCy("hsv-value").should("have.text", "HSV (179, 0.78, 0.29)");
+    cy.dataCy("hcl-value").should("have.text", "HCL (179, 0.78, 0.25)");
     cy.dataCy("hex-value").should("have.text", "HEX: #104B4A");
   });
 });

src/components/ColorValues/ValueEditor.test.cy.tsx

@@ -55,7 +55,7 @@ describe("component editor tests", () => {
     cy.dataCy("R-slider")
       .click()
       .dataCy("R-slider-bar")
-      .should("have.css", "width", "138px")
+      .should("have.css", "width", "140px")
       .dataCy("R-value-input")
       .should("have.value", "127");
 
@@ -80,7 +80,7 @@ describe("component editor tests", () => {
       .type("100")
       .should("have.value", "100")
       .dataCy("R-slider-bar")
-      .should("have.css", "width", "109px");
+      .should("have.css", "width", "110px");
 
     // Scrolling input should update value
     cy.dataCy("R-value-input")
@@ -134,7 +134,7 @@ describe("component editor tests", () => {
     cy.dataCy("R-slider")
       .click()
       .dataCy("R-slider-bar")
-      .should("have.css", "width", "138px")
+      .should("have.css", "width", "140px")
       .dataCy("R-value-input")
       .should("have.value", "127");
 

src/components/ColorValues/ValueEditor.tsx

@@ -1,19 +1,15 @@
 import { useEffect, useRef, useState } from "react";
 import type { ChangeEvent, KeyboardEvent, RefObject } from "react";
 
-import {
-  faChevronLeft,
-  faChevronRight,
-} from "@fortawesome/free-solid-svg-icons";
-import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
-
 import clsx from "clsx";
 import * as colorlib from "colorlib";
+import { ChevronLeft, ChevronRight } from "lucide-react";
 
 import type { HexColorActions } from "@/hooks/color";
+import { extractHexValue, formatHexString } from "@/hooks/hex";
 import { useScroll } from "@/hooks/scroll";
 import { useSlider } from "@/hooks/slider";
-import { useResize } from "@/hooks/window";
+import { onResize } from "@/hooks/window";
 import type { CartesianSpace, Range, Setter, Timeout } from "@/types";
 import { Direction } from "@/types";
 import { minmax, roundTo, setMeasurements, valueToPosition } from "@/util";
@@ -89,9 +85,7 @@ export function ValueEditor({
   // Set component dimensions for slider hook
   useEffect(() => {
     setMeasurements(sliderRef, setOrigin, setDimensions);
-    return useResize(() =>
-      setMeasurements(sliderRef, setOrigin, setDimensions),
-    );
+    return onResize(() => setMeasurements(sliderRef, setOrigin, setDimensions));
   }, [sliderRef, setOrigin, setDimensions]);
 
   return (
@@ -209,7 +203,7 @@ function Button({
 }) {
   const isIncrease = direction === "increase";
   const label = isIncrease ? "Increase" : "Decrease";
-  const icon = isIncrease ? faChevronRight : faChevronLeft;
+  const Icon = isIncrease ? ChevronRight : ChevronLeft;
   const dataCy = `${componentSymbol}-${isIncrease ? "increment" : "decrement"}-button`;
 
   const step = isIncrease ? 1 : -1;
@@ -234,7 +228,7 @@ function Button({
         data-cy={dataCy}
         onKeyDown={handleKeyDown}
       >
-        <FontAwesomeIcon icon={icon} transform="shrink-2 down-1" />
+        <Icon size={18} />
       </button>
     </div>
   );
@@ -338,8 +332,8 @@ function useLongPressRepeat(
     onMouseLeave: stop,
     onTouchStart: start,
     onTouchEnd: stop,
-    // Intentional 'any' to avoid overly complex typing
-    onContextMenu: (e: Event | any) => e.preventDefault(),
+    // @ts-expect-error: Avoid overly complex typing
+    onContextMenu: (e) => e.preventDefault(),
   };
 }
 
@@ -347,30 +341,6 @@ function useLongPressRepeat(
 // Hex Editor //
 // ---------- //
 
-const extractHexValue = (value: string): string | null => {
-  const match = value.match(/^#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})$/);
-  return match ? match[1] : null;
-};
-
-const formatHexString = (
-  color: colorlib.Hex,
-  preserveShortFormat: boolean = false,
-): string => {
-  const hexValue = color.to_code();
-
-  if (preserveShortFormat) {
-    if (
-      hexValue[0] === hexValue[1] &&
-      hexValue[2] === hexValue[3] &&
-      hexValue[4] === hexValue[5]
-    ) {
-      return `#${hexValue[0]}${hexValue[2]}${hexValue[4]}`;
-    }
-  }
-
-  return `#${color.to_code()}`;
-};
-
 export function HexEditor({
   color,
   actions,
@@ -382,24 +352,34 @@ export function HexEditor({
 }) {
   const [inputValue, setInputValue] = useState(formatHexString(color));
   const [isShortHex, setIsShortHex] = useState(false);
+  const isFocused = useRef(false);
 
   useEffect(() => {
+    if (!isFocused.current) {
       setInputValue(formatHexString(color, isShortHex));
-  }, [color]);
+    }
+  }, [color, isShortHex]);
+
+  const onFocus = (e: ChangeEvent<HTMLInputElement>) => {
+    isFocused.current = true;
+    e.target.select();
+  };
 
   const onChange = (e: ChangeEvent<HTMLInputElement>) => {
     const value = e.target.value;
     setInputValue(value);
+  };
 
-    const hex = extractHexValue(value);
+  const onBlur = () => {
+    isFocused.current = false;
+    const hex = extractHexValue(inputValue);
     if (hex) {
       setIsShortHex(hex.length === 3);
       const newColor = colorlib.Hex.from_code(hex);
       actions.setHex(newColor);
+      setInputValue(formatHexString(newColor, isShortHex));
+      return;
     }
-  };
-
-  const onBlur = () => {
     setInputValue(formatHexString(color));
   };
 
@@ -421,7 +401,7 @@ export function HexEditor({
           value={inputValue}
           onChange={onChange}
           onBlur={onBlur}
-          onFocus={(e) => e.target.select()}
+          onFocus={onFocus}
           onKeyDown={handleKeyDown}
         />
       </div>

src/components/PaletteEditor/PaletteEditor.module.css

@@ -1,16 +1,466 @@
-/* Large - Landscape Tablets / Desktops */
-/* Medium - Portrait Tablets */
-/* Horizontal layout, vertically scrolling picker and palette content */
-@media (min-width: 992px),
-  (min-width: 568px) and (max-width: 991px) and (orientation: portrait) {
+.paletteEditor {
+  height: 100%;
+  width: 100%;
+  display: flex;
+  flex-direction: column;
 }
 
-/* Medium - Landscape Phones */
-/* Horizontal layout, side menu, vertical tabbed picker */
-@media (min-width: 568px) and (max-width: 991px) and (orientation: landscape) {
+.actionBar {
+  padding: 10px 11px;
+  border-bottom: 1px solid #c9c9c9;
+  display: flex;
 }
 
-/* Small - Portrait Phones*/
-/* Vertical layout, side menu, horizontal tabbed picker */
-@media (max-width: 567px) {
+.actionBar .actionButton {
+  cursor: pointer;
+  margin: 4px;
+  background-color: #e7e7e7;
+  border-radius: 0;
+  border: 1px solid #e2e2e2;
+  box-shadow:
+    rgba(60, 64, 67, 0.3) 0px 1px 2px 0px,
+    rgba(60, 64, 67, 0.05) 0px 2px 6px 1px;
+  transition-property: background-color, box-shadow;
+  transition-duration: 150ms;
+  transition-timing-function: ease-out;
+}
+
+.actionBar .actionButton:hover {
+  background-color: #f0f0f0;
+  box-shadow:
+    rgba(60, 64, 67, 0.25) 0px 3px 6px 0px,
+    rgba(60, 64, 67, 0.1) 0px 4px 8px 2px;
+  transform: translateY(-1px);
+}
+
+.actionBar .actionButton:active {
+  background-color: #d1d1d1;
+  box-shadow:
+    rgba(60, 64, 67, 0.3) 0px 1px 1px 0px,
+    inset 0px 1px 2px rgba(0, 0, 0, 0.2);
+  transform: translateY(1px);
+  transition-duration: 50ms;
+}
+
+.actionBar .iconButton {
+  aspect-ratio: 1;
+}
+
+.actionBar .wordButton {
+  font-size: 14px;
+  padding: 4px 4px;
+}
+
+.actionBar .activeButton {
+  background-color: #f8b800;
+  border-color: #e1964b;
+  box-shadow:
+    rgba(60, 64, 67, 0.25) 0px 1px 2px 0px,
+    0 0 8px 1px rgba(255, 163, 56, 0.5),
+    inset 0 0 4px rgba(255, 255, 255, 0.4);
+}
+
+.actionBar .activeButton:hover {
+  background-color: #fea944;
+  box-shadow:
+    rgba(60, 64, 67, 0.25) 0px 2px 4px 0px,
+    0 0 12px 2px rgba(255, 163, 56, 0.6),
+    inset 0 0 4px rgba(255, 255, 255, 0.5);
+  transform: translateY(-0.5px);
+}
+
+.actionBar .activeButton:active {
+  background-color: #eb8d16;
+  box-shadow:
+    rgba(60, 64, 67, 0.2) 0px 0px 1px 0px,
+    0 0 4px 0px rgba(255, 163, 56, 0.4),
+    inset 0px 1px 2px rgba(0, 0, 0, 0.2);
+  transform: translateY(0.5px);
+  transition-duration: 50ms;
+}
+
+.cardWrapper {
+  flex: 1;
+  margin: 32px;
+  display: grid;
+  border-radius: 8px;
+  grid-template-columns: 1fr 1fr 4fr;
+  grid-template-rows: auto 1fr;
+  grid-template-areas:
+    "sync sync card-header"
+    "preview selection palette";
+  overflow-y: auto;
+  /* border: 1px solid #ddd; */
+  box-shadow:
+    rgba(0, 0, 0, 0.19) 0px 10px 20px,
+    rgba(0, 0, 0, 0.23) 0px 6px 6px;
+}
+
+.sync {
+  grid-area: sync;
+  cursor: pointer;
+  display: flex;
+  flex-direction: row;
+  justify-content: center;
+  align-items: center;
+  background-color: #f6f6f6;
+  border-right: 2px solid #aaa;
+  border-bottom: 2px solid #aaa;
+  transition-property: background-color;
+  transition-duration: 150ms;
+  transition-timing-function: ease-out;
+}
+
+.sync:hover {
+  background-color: #f1f1f1;
+}
+
+.sync:active {
+  background-color: #e7e7e7;
+}
+
+.sync .leftSpan {
+  flex: 1;
+  text-align: right;
+}
+
+.sync .middleSpan {
+  flex: 0 0 auto;
+  display: flex;
+  align-items: middle;
+  margin: 0px 8px;
+}
+
+.sync .rightSpan {
+  flex: 1;
+  text-align: left;
+}
+
+.cardHeader {
+  grid-area: card-header;
+  display: flex;
+  padding: 4px 8px 8px;
+  color: #292929;
+  background-color: #f6f6f6;
+  font-size: 20px;
+  font-weight: 700;
+  border-bottom: 2px solid #aaa;
+}
+
+.cardHeader .editableFieldWrapper {
+  display: flex;
+  align-items: center;
+}
+
+.cardHeader .editableField {
+}
+
+.cardHeader .editingField {
+  outline: none;
+}
+
+.cardHeader .editableFieldButton {
+  cursor: pointer;
+  color: black;
+  background-color: rgba(0, 0, 0, 0.1);
+  margin: 2px -2px 2px 8px;
+  padding: 5px 6px;
+  border: none;
+  border-radius: 4px;
+  transition-property: background-color;
+  transition-duration: 150ms;
+  transition-timing-function: ease-out;
+}
+
+.cardHeader .editableFieldButton:hover {
+  background-color: rgba(0, 0, 0, 0.15);
+}
+
+.cardHeader .editableFieldButton:active {
+  background-color: rgba(0, 0, 0, 0.2);
+}
+
+.pickerColor {
+  grid-area: preview;
+  display: flex;
+  align-items: center;
+  padding: 10px;
+}
+
+.paletteColor {
+  grid-area: selection;
+  display: flex;
+  align-items: center;
+  padding: 10px;
+}
+
+.pickerColor .arrowIndicator {
+  margin-left: auto;
+}
+
+@keyframes slideRight {
+  0% {
+    transform: translateX(0);
+  }
+  50% {
+    transform: translateX(3px);
+  }
+  100% {
+    transform: translateX(0);
+  }
+}
+
+@keyframes slideLeft {
+  0% {
+    transform: translateX(0);
+  }
+  50% {
+    transform: translateX(-3px);
+  }
+  100% {
+    transform: translateX(0);
+  }
+}
+
+.pickerColor:hover .arrowIndicator {
+  animation: slideRight 1.5s ease-in-out infinite;
+}
+
+.paletteColor:hover .arrowIndicator {
+  animation: slideLeft 1.5s ease-in-out infinite;
+}
+
+.previewPane .arrowIndicator {
+  transform: translateX(0);
+}
+
+.previewPane .arrowIndicatorDark {
+  color: rgba(0, 0, 0, 0.4);
+}
+
+.previewPane:hover .arrowIndicatorDark {
+  color: rgba(0, 0, 0, 0.7);
+}
+
+.previewPane:active .arrowIndicatorDark {
+  color: rgba(0, 0, 0, 0.5);
+}
+
+.previewPane .arrowIndicatorLight {
+  color: rgba(255, 255, 255, 0.4);
+}
+
+.previewPane:hover .arrowIndicatorLight {
+  color: rgba(255, 255, 255, 0.7);
+}
+
+.previewPane:active .arrowIndicatorLight {
+  color: rgba(255, 255, 255, 0.5);
+}
+
+.palette {
+  grid-area: palette;
+  display: flex;
+  flex-direction: column;
+  overflow-y: auto;
+  min-height: 0;
+  background-color: #f7f7f7;
+}
+
+.paletteRowWrapper {
+  flex: 1;
+  cursor: pointer;
+  min-height: 3em;
+}
+
+.paletteRowWrapper.draggable {
+  cursor: grab;
+}
+
+.paletteRowWrapper.dragging {
+  cursor: grabbing;
+}
+
+.paletteRowWrapper.dragging .paletteRow,
+.paletteRowWrapper.multiSelected .paletteRow {
+  transform: scale(0.96, 0.9);
+  border-radius: 8px;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
+  z-index: 10;
+}
+
+.paletteRow {
+  width: 100%;
+  height: 100%;
+  position: relative;
+  transition:
+    transform 200ms ease-out,
+    border-radius 200ms ease-out;
+}
+
+.paletteRow .selectedIndicator {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+}
+
+.paletteRow .indicatorDark {
+  color: rgba(0, 0, 0, 0.7);
+}
+
+.paletteRow .indicatorLight {
+  color: rgba(255, 255, 255, 0.7);
+}
+
+.paletteRow .targettedIndicator {
+  opacity: 0;
+  visibility: hidden;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  transition: opacity 150ms ease-out;
+}
+
+.paletteRow:hover .targettedIndicator {
+  opacity: 1;
+  visibility: visible;
+}
+
+.modeDecorator {
+  position: absolute;
+  right: 8px;
+  top: 50%;
+  transform: translateY(-50%);
+  pointer-events: none;
+}
+
+.checkDecorator {
+  width: 20px;
+  height: 20px;
+  border-radius: 3px;
+  border: 2px solid;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.checkDecoratorDark {
+  color: rgba(0, 0, 0, 0.8);
+  border-color: rgba(0, 0, 0, 0.5);
+  background-color: rgba(255, 255, 255, 0.15);
+}
+.checkDecoratorLight {
+  color: rgba(255, 255, 255, 0.8);
+  border-color: rgba(255, 255, 255, 0.5);
+  background-color: rgba(0, 0, 0, 0.2);
+}
+
+.gripDark {
+  color: rgba(0, 0, 0, 0.4);
+}
+.gripLight {
+  color: rgba(255, 255, 255, 0.4);
+}
+
+.paletteRowDataWithDecorator {
+  padding-right: 36px;
+}
+
+.paletteRowData {
+  display: flex;
+  padding: 10px;
+  align-items: center;
+}
+
+.paletteRowData .colorName {
+  font-size: 14px;
+}
+
+.paletteRowData .colorHex {
+  font-size: 14px;
+  font-family: monospace;
+  margin-left: auto;
+}
+
+.paletteRow .editableFieldWrapper {
+  display: flex;
+  align-items: center;
+}
+
+.paletteRow .editableField,
+.paletteRow .field {
+  cursor: text;
+  border-radius: 4px;
+  margin-right: 2px;
+}
+
+.paletteRow .editableFieldDark,
+.paletteRow .fieldDark {
+  color: rgba(0, 0, 0, 0.95);
+  background-color: rgba(255, 255, 255, 0.4);
+}
+
+.paletteRow .editableFieldLight,
+.paletteRow .fieldLight {
+  color: rgba(255, 255, 255, 0.95);
+  background-color: rgba(0, 0, 0, 0.2);
+}
+
+.paletteRow .editableFieldButton {
+  transition-property: color;
+  transition-duration: 150ms;
+  transition-timing-function: ease-out;
+}
+
+.paletteRow .editableFieldButtonDark {
+  color: rgba(0, 0, 0, 0.5);
+  background-color: rgba(0, 0, 0, 0);
+}
+
+.paletteRow .editableFieldButtonDark:hover {
+  color: rgba(0, 0, 0, 0.8);
+}
+
+.paletteRow .editableFieldButtonDark:active {
+  color: rgba(0, 0, 0, 0.6);
+}
+
+.paletteRow .editableFieldButtonLight {
+  color: rgba(255, 255, 255, 0.5);
+  background-color: rgba(0, 0, 0, 0);
+}
+
+.paletteRow .editableFieldButtonLight:hover {
+  color: rgba(255, 255, 255, 0.8);
+}
+
+.paletteRow .editableFieldButtonLight:active {
+  color: rgba(255, 255, 255, 0.6);
+}
+
+.paletteRow .editingField {
+  outline: none;
+}
+
+.paletteRow .colorHex {
+  width: 124px;
+}
+
+.colorName .editableField,
+.colorName .field {
+  padding: 1px 8px;
+}
+
+.colorHex .editableField,
+.colorHex .field {
+  padding: 3px 8px;
+}
+
+.paletteRow .editableFieldButton {
+  cursor: pointer;
+  padding-left: 4px;
+  border: none;
+  border-radius: 4px;
 }

src/components/PaletteEditor/PaletteEditor.test.cy.tsx

@@ -0,0 +1,365 @@
+import { useReducer } from "react";
+
+import { Color, Hex as HexColor } from "colorlib";
+
+import { HexEditor } from "@/components/ColorValues/ValueEditor";
+import { colorReducer, createColorActions } from "@/hooks/color";
+import type { PaletteCardState } from "@/hooks/paletteCard";
+
+import PaletteEditor from "./PaletteEditor";
+
+const initialPickerState = {
+  color: Color.from_hex("000"),
+};
+
+const defaultPaletteCard = {
+  id: "card_id",
+  name: "Test Palette",
+  colors: [
+    { id: "red", name: "Red", hex: HexColor.from_code("FF0000") },
+    { id: "green", name: "Green", hex: HexColor.from_code("00FF00") },
+    { id: "blue", name: "Blue", hex: HexColor.from_code("0000FF") },
+  ],
+  selectedColorIds: [],
+};
+
+const defaultPaletteCardState = {
+  present: defaultPaletteCard,
+  history: [],
+  future: [],
+};
+
+function TestWrapper({
+  initialCardState,
+}: {
+  initialCardState?: PaletteCardState;
+}) {
+  const [state, dispatch] = useReducer(colorReducer, initialPickerState);
+  const actions = createColorActions(dispatch);
+
+  return (
+    <>
+      <div style={{ width: "100%", height: 400 }}>
+        <PaletteEditor
+          pickerColor={state.color.hex}
+          setPickerColor={actions.hex.setHex}
+          initialCardState={initialCardState}
+        />
+      </div>
+      <HexEditor color={state.color.hex} actions={actions.hex} />
+    </>
+  );
+}
+
+it("can edit the palette header", () => {
+  cy.mount(<TestWrapper />);
+
+  cy.dataCy("card-header").as("header");
+  cy.dataCy("card-name").as("name").contains("New Palette");
+
+  // Edit the name
+  cy.dataCy("card-name-edit").as("edit").click();
+  cy.dataCy("card-name-input")
+    .as("input")
+    .should("exist")
+    .should("be.focused")
+    .type("Summer Colors")
+    .wait(0);
+
+  cy.dataCy("card-name-confirm").as("confirm").click();
+  cy.get("@name").contains("Summer Colors");
+
+  // Edit, then cancel
+  cy.get("@edit").click();
+  cy.get("@input").type("Winter Colors").wait(0);
+
+  cy.dataCy("card-name-cancel").as("cancel").click();
+  cy.get("@name").contains("Summer Colors");
+
+  // Enter should confirm
+  cy.get("@edit").click();
+  cy.get("@input").type("Winter Colors").type("{enter}").wait(0);
+  cy.get("@name").contains("Winter Colors");
+
+  // Escape should cancel
+  cy.get("@edit").click();
+  cy.get("@input").type("Fall Colors").type("{esc}").wait(0);
+  cy.get("@name").contains("Winter Colors");
+
+  // Input contents should reset
+  cy.get("@edit").click();
+  cy.get("@input").should("contain.text", "Winter Colors");
+});
+
+it("can perform actions in normal mode", () => {
+  cy.mount(<TestWrapper />);
+
+  // Empty palette renders no rows
+  cy.dataCy("palette").as("palette").contains("No colors in palette.");
+  cy.dataCy("delete").should("be.disabled");
+  cy.dataCy("duplicate").should("be.disabled");
+
+  // Add a color
+  cy.dataCy("add").as("add").click();
+  cy.dataCy("palette-row-0").as("row0").should("exist");
+  cy.get("@row0").contains("New Color");
+  cy.get("@row0").contains("#000000");
+
+  // Select the color
+  cy.get("@row0").click().should("have.attr", "aria-selected", "true");
+  cy.dataCy("selected-preview")
+    .as("preview")
+    .should("have.css", "background-color", "rgb(0, 0, 0)");
+
+  // Change the color name and value
+  cy.dataCy("palette-row-name-0-edit").click();
+  cy.dataCy("palette-row-name-0-input").type("Red{enter}").wait(0);
+  cy.dataCy("palette-row-hex-0-edit").click();
+  cy.dataCy("palette-row-hex-0-input").type("F00{enter}").wait(0);
+  cy.get("@row0").contains("Red");
+  cy.get("@row0").contains("#FF0000");
+  cy.get("@preview").should("have.css", "background-color", "rgb(255, 0, 0)");
+
+  // Add a second color
+  cy.get("@add").click();
+  cy.dataCy("palette-row-1").as("row1").should("exist");
+
+  // Selecting the second deselects the first
+  cy.get("@row1").click().should("have.attr", "aria-selected", "true");
+  cy.get("@row0").should("have.attr", "aria-selected", "false");
+
+  // Select none
+  cy.get("@row1").click("top");
+
+  // Delete and Duplicate should be disabled
+  cy.dataCy("delete").as("delete").should("be.disabled");
+  cy.dataCy("duplicate").as("duplicate").should("be.disabled");
+
+  // Delete the first row
+  cy.get("@row0").click();
+  cy.get("@delete").click();
+
+  // Second row becomes first
+  cy.get("@row0").contains("New Color");
+
+  // Duplicate a color
+  cy.get("@add").click();
+  cy.get("@row0").click();
+  cy.dataCy("palette-row-name-0-edit").click();
+  cy.dataCy("palette-row-name-0-input").type("Red{enter}").wait(0);
+  cy.dataCy("palette-row-hex-0-edit").click();
+  cy.dataCy("palette-row-hex-0-input").type("F00{enter}").wait(0);
+
+  // Dupliated color appears below selected row
+  cy.get("@duplicate").click();
+  cy.get("@row0").contains("#FF0000");
+  cy.get("@row1").contains("#FF0000");
+  cy.dataCy("palette-row-2").as("row2").contains("#000000");
+
+  // Undo removes duplicate
+  cy.dataCy("redo").as("redo").should("be.disabled");
+  cy.dataCy("undo").as("undo").should("be.enabled").click();
+
+  cy.get("@row0").contains("#FF0000");
+  cy.get("@row1").contains("#000000");
+
+  // Redo adds duplicate back
+  cy.get("@redo").click();
+  cy.get("@row0").contains("#FF0000");
+  cy.get("@row1").contains("#FF0000");
+  cy.get("@row2").contains("#000000");
+});
+
+it.only("can manually sync picker and palette", () => {
+  cy.mount(<TestWrapper initialCardState={defaultPaletteCardState} />);
+
+  cy.dataCy("hex-value-input").as("hex");
+  cy.dataCy("picker-preview").as("picker");
+  cy.dataCy("selected-preview").as("palette");
+  cy.dataCy("palette-row-0").as("row0");
+  cy.dataCy("palette-row-1").as("row1");
+  cy.dataCy("palette-row-2").as("row2");
+
+  // Ensure picker and preview colors are set to default
+  cy.get("@hex").should("have.value", "#000000");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 0, 0)");
+
+  // Clicking the picker when no colors are selected does nothing
+  cy.get("@picker").click();
+
+  // Select a color and sync it to the picker
+  cy.get("@row1").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.get("@picker")
+    .click()
+    .should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.get("@hex").should("have.value", "#00FF00");
+
+  // Select a new color, picker remains the same
+  cy.get("@row0").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(255, 0, 0)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 255, 0)");
+
+  // Change picker color, sync back to palette.
+  cy.get("@hex").focus().type("FFFF00{esc}").wait(0);
+  cy.get("@picker").should("have.css", "background-color", "rgb(255, 255, 0)");
+  cy.get("@palette").click();
+  cy.get("@row0").contains("#FFFF00");
+});
+
+it("can automatically sync picker and palette", () => {
+  cy.clock();
+  cy.mount(<TestWrapper initialCardState={defaultPaletteCardState} />);
+
+  cy.dataCy("undo").as("undo");
+  cy.dataCy("redo").as("redo");
+  cy.dataCy("sync").as("sync");
+  cy.dataCy("hex-value-input").as("hex");
+  cy.dataCy("picker-preview").as("picker");
+  cy.dataCy("selected-preview").as("palette");
+  cy.dataCy("palette-row-0").as("row0");
+  cy.dataCy("palette-row-1").as("row1");
+  cy.dataCy("palette-row-2").as("row2");
+
+  // Enable color sync
+  cy.get("@sync").click().should("have.attr", "aria-pressed", "true");
+
+  // No color selected, all previews are default
+  cy.get("@hex").should("have.value", "#000000");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 0, 0)");
+
+  // Select a color, picker should sync
+  cy.get("@row1").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.get("@hex").should("have.value", "#00FF00");
+
+  // Change picker color, palette should sync
+  cy.get("@hex").type("#FF00FF{esc}").wait(0);
+  cy.get("@palette").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@row1").contains("#FF00FF");
+
+  // Turning on sync mode should set picker to selected palette color
+  cy.get("@sync").click();
+  cy.get("@row2").click();
+  cy.get("@sync").click();
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 0, 255)");
+  cy.get("@hex").should("have.value", "#0000FF");
+
+  // History updates after timeout
+
+  cy.get("@hex").type("#FF00FF{esc}").wait(0);
+  cy.get("@picker").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.tick(3000);
+  cy.get("@hex").type("#00FF00{esc}").wait(0);
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.tick(3000);
+
+  // undo goes back to pink, then blue
+  cy.get("@undo").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@hex").should("have.value", "#FF00FF");
+  cy.get("@undo").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(0, 0, 255)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 0, 255)");
+  cy.get("@hex").should("have.value", "#0000FF");
+
+  // redo goes to pink, then green
+  cy.get("@redo").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(255, 0, 255)");
+  cy.get("@redo").click();
+  cy.get("@palette").should("have.css", "background-color", "rgb(0, 255, 0)");
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 255, 0)");
+
+  // undo during timeout wipes intermediate state
+  cy.get("@hex").type("#0000FF{esc}").wait(0);
+  cy.tick(3000); // lock in blue
+  cy.get("@hex").type("#FF00FF{esc}").wait(0); // pink is debounced
+  cy.get("@hex").type("#00FF00{esc}").wait(0);
+  cy.tick(3000); // lock in green
+
+  // pink state is lost, undo goes back to blue
+  cy.get("@undo").click();
+  cy.get("@picker").should("have.css", "background-color", "rgb(0, 0, 255)");
+
+  cy.clock().then((clock) => clock.restore());
+});
+
+it("can perform actions in edit mode", () => {
+  cy.mount(<TestWrapper initialCardState={defaultPaletteCardState} />);
+
+  cy.dataCy("select").as("select");
+  cy.dataCy("palette-row-0").as("row0");
+  cy.dataCy("palette-row-1").as("row1");
+  cy.dataCy("palette-row-2").as("row2");
+
+  // enter select mode
+  cy.get("@select").click().should("have.attr", "aria-pressed", "true");
+
+  cy.dataCy("select-all").as("select-all");
+  cy.dataCy("clear").as("clear");
+
+  // select multiple colors
+  cy.get("@row0").should("have.attr", "aria-selected", "false");
+  cy.get("@row1").should("have.attr", "aria-selected", "false");
+
+  cy.get("@row0").click();
+  cy.get("@row1").click();
+
+  cy.get("@row0").should("have.attr", "aria-selected", "true");
+  cy.get("@row1").should("have.attr", "aria-selected", "true");
+
+  // clear selection
+  cy.get("@clear").click();
+  cy.get("@row0").should("have.attr", "aria-selected", "false");
+  cy.get("@row1").should("have.attr", "aria-selected", "false");
+
+  // select all
+  cy.get("@select-all").click();
+  cy.get("@row0").should("have.attr", "aria-selected", "true");
+  cy.get("@row1").should("have.attr", "aria-selected", "true");
+  cy.get("@row2").should("have.attr", "aria-selected", "true");
+
+  // leave select mode
+  cy.get("@select").click().should("have.attr", "aria-pressed", "false");
+  cy.get("@row0").should("have.attr", "aria-selected", "false");
+  cy.get("@row1").should("have.attr", "aria-selected", "false");
+  cy.get("@row2").should("have.attr", "aria-selected", "false");
+});
+
+it("can reorder colors in reorder mode", () => {
+  cy.mount(<TestWrapper initialCardState={defaultPaletteCardState} />);
+
+  // enter reorder mode
+  cy.dataCy("reorder").click().should("have.attr", "aria-pressed", "true");
+
+  // drag red down to green
+  cy.dataCy("palette-row-0-wrapper").trigger("mousedown", {
+    buttons: 1,
+    eventConstructor: "MouseEvent",
+  });
+  cy.dataCy("palette-row-1-wrapper").trigger("mousemove", {
+    buttons: 1,
+    eventConstructor: "MouseEvent",
+  });
+  cy.dataCy("palette-row-1-wrapper").trigger("mouseup", {
+    buttons: 1,
+    eventConstructor: "MouseEvent",
+  });
+
+  // green should now be first
+  cy.dataCy("palette-row-0").contains("Green");
+  cy.dataCy("palette-row-1").contains("Red");
+  cy.dataCy("palette-row-2").contains("Blue");
+
+  // leave reorder mode
+  cy.dataCy("reorder").click().should("have.attr", "aria-pressed", "false");
+
+  // order should persist
+  cy.dataCy("palette-row-0").contains("Green");
+  cy.dataCy("palette-row-1").contains("Red");
+  cy.dataCy("palette-row-2").contains("Blue");
+});

src/components/PaletteEditor/PaletteEditor.tsx

@@ -0,0 +1,917 @@
+import { useEffect, useMemo, useReducer, useRef, useState } from "react";
+import type { KeyboardEvent, MouseEvent, RefObject } from "react";
+
+import clsx from "clsx";
+import { Hex as HexColor } from "colorlib";
+import {
+  Check,
+  CheckCheck,
+  ChevronsLeft,
+  ChevronsRight,
+  CircleDashed,
+  Copy,
+  Crosshair,
+  Dot,
+  GripVertical,
+  Pencil,
+  Plus,
+  Redo2,
+  RefreshCw,
+  RefreshCwOff,
+  Trash2,
+  Undo2,
+  X,
+} from "lucide-react";
+import { motion } from "motion/react";
+
+import type { ContrastToken } from "@/hooks/contrast";
+import { luminanceFromHex, useContrastToken } from "@/hooks/contrast";
+import { useDragAndDrop } from "@/hooks/dragAndDrop";
+import { extractHexValue, formatHexString } from "@/hooks/hex";
+import {
+  createPaletteCardActions,
+  paletteCardReducer,
+} from "@/hooks/paletteCard";
+import type {
+  PaletteCard,
+  PaletteCardActions,
+  PaletteCardState,
+  PaletteColor,
+  PaletteMode,
+} from "@/hooks/paletteCard";
+import {
+  loadCards,
+  saveActiveCardId,
+  saveCards,
+  serializeCard,
+} from "@/hooks/storage";
+import { randomId } from "@/util";
+
+import styles from "./PaletteEditor.module.css";
+
+type Timeout = ReturnType<typeof setTimeout>;
+
+const SYNC_DELAY = 2000;
+const DEFAULT_BG = HexColor.from_code("f6f6f6");
+
+function defaultPaletteCard(): PaletteCardState {
+  const defaultCard = {
+    id: randomId(),
+    name: "New Palette",
+    colors: [],
+    selectedColorIds: [],
+  };
+
+  return {
+    present: defaultCard,
+    history: [],
+    future: [],
+  };
+}
+
+function PaletteEditor({
+  pickerColor,
+  setPickerColor,
+  initialCardState,
+}: {
+  pickerColor: HexColor;
+  setPickerColor: (hex: HexColor) => void;
+  initialCardState?: PaletteCardState;
+}) {
+  const [cardState, dispatch] = useReducer(
+    paletteCardReducer,
+    initialCardState || defaultPaletteCard(),
+  );
+  const actions = useMemo(() => createPaletteCardActions(dispatch), [dispatch]);
+  const [historyCounter, setHistoryCounter] = useState(0);
+  const [mode, setMode] = useState<PaletteMode>("normal");
+  const [isSynced, setIsSynced] = useState(false);
+  const snapshotRef = useRef<PaletteCard | null>(null);
+  const timerRef = useRef<Timeout | null>(null);
+
+  const incrementHistoryCounter = () => {
+    setHistoryCounter((prev) => prev + 1);
+  };
+
+  useEffect(() => {
+    saveActiveCardId(cardState.present.id);
+  }, []);
+
+  useEffect(() => {
+    const cards = loadCards();
+    cards[cardState.present.id] = serializeCard(cardState.present);
+    saveCards(cards);
+  }, [cardState.present]);
+
+  return (
+    <div className={styles.paletteEditor} data-cy="palette-editor">
+      <ActionBar
+        mode={mode}
+        setMode={setMode}
+        actions={actions}
+        hasSelection={cardState.present.selectedColorIds.length > 0}
+        canUndo={cardState.history.length > 0}
+        canRedo={cardState.future.length > 0}
+        isSynced={isSynced}
+        incrementHistoryCounter={incrementHistoryCounter}
+        snapshotRef={snapshotRef}
+        syncTimerRef={timerRef}
+      />
+      <PaletteCard
+        pickerColor={pickerColor}
+        setPickerColor={setPickerColor}
+        cardState={cardState.present}
+        actions={actions}
+        mode={mode}
+        isSynced={isSynced}
+        setIsSynced={setIsSynced}
+        snapshotRef={snapshotRef}
+        syncTimerRef={timerRef}
+        historyCounter={historyCounter}
+      />
+    </div>
+  );
+}
+
+function ActionBar({
+  mode,
+  setMode,
+  actions,
+  hasSelection,
+  canUndo,
+  canRedo,
+  isSynced,
+  incrementHistoryCounter,
+  snapshotRef,
+  syncTimerRef,
+}: {
+  mode: PaletteMode;
+  setMode: (mode: PaletteMode) => void;
+  actions: PaletteCardActions;
+  hasSelection: boolean;
+  canUndo: boolean;
+  canRedo: boolean;
+  isSynced: boolean;
+  incrementHistoryCounter: () => void;
+  snapshotRef: RefObject<PaletteCard | null>;
+  syncTimerRef: RefObject<Timeout | null>;
+}) {
+  const clearSyncTimeout = () => {
+    if (syncTimerRef.current) clearTimeout(syncTimerRef.current);
+    snapshotRef.current = null;
+  };
+
+  const handleUndo = () => {
+    if (isSynced) clearSyncTimeout();
+    incrementHistoryCounter();
+    actions.undo();
+  };
+
+  const handleRedo = () => {
+    if (isSynced) clearSyncTimeout();
+    incrementHistoryCounter();
+    actions.redo();
+  };
+
+  const handleModeChange = (next: PaletteMode) => {
+    if (mode === "normal") {
+      if (isSynced && syncTimerRef.current) {
+        clearTimeout(syncTimerRef.current);
+        if (snapshotRef.current) {
+          actions.commitToHistory(snapshotRef.current);
+          snapshotRef.current = null;
+        }
+      }
+    }
+    actions.clearSelection();
+    setMode(next);
+  };
+
+  return (
+    <div className={styles.actionBar} data-cy="action-bar">
+      <button
+        className={clsx(styles.actionButton, styles.iconButton)}
+        data-cy="undo"
+        disabled={!canUndo}
+        onClick={handleUndo}
+        title="Undo"
+      >
+        <Undo2 size={16} />
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.iconButton)}
+        data-cy="redo"
+        disabled={!canRedo}
+        onClick={handleRedo}
+        title="Redo"
+      >
+        <Redo2 size={16} />
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.iconButton)}
+        data-cy="add"
+        onClick={actions.addColor}
+        title="Add Color"
+      >
+        <Plus size={16} />
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.iconButton)}
+        data-cy="delete"
+        disabled={!hasSelection}
+        onClick={actions.deleteSelectedColors}
+        title="Delete Selected"
+      >
+        <Trash2 size={16} />
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.iconButton)}
+        data-cy="duplicate"
+        disabled={!hasSelection}
+        onClick={actions.duplicateSelectedColors}
+        title="Duplicate Selected"
+      >
+        <Copy size={16} />
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.wordButton, {
+          [styles.activeButton]: mode === "reorder",
+        })}
+        data-cy="reorder"
+        aria-pressed={mode === "reorder"}
+        onClick={() =>
+          handleModeChange(mode === "reorder" ? "normal" : "reorder")
+        }
+        title="Reorder Colors"
+      >
+        Reorder
+      </button>
+      <button
+        className={clsx(styles.actionButton, styles.wordButton, {
+          [styles.activeButton]: mode === "select",
+        })}
+        data-cy="select"
+        aria-pressed={mode === "select"}
+        onClick={() =>
+          handleModeChange(mode === "select" ? "normal" : "select")
+        }
+        title="Select Multiple"
+      >
+        Select
+      </button>
+      {mode === "select" && (
+        <>
+          <button
+            className={clsx(styles.actionButton, styles.iconButton)}
+            data-cy="select-all"
+            onClick={actions.selectAll}
+            title="Select All"
+          >
+            <CheckCheck size={16} />
+          </button>
+          <button
+            className={clsx(styles.actionButton, styles.iconButton)}
+            data-cy="clear"
+            onClick={actions.clearSelection}
+            title="Clear Selections"
+          >
+            <X size={16} />
+          </button>
+        </>
+      )}
+    </div>
+  );
+}
+
+function PaletteCard({
+  pickerColor,
+  setPickerColor,
+  cardState,
+  actions,
+  mode,
+  isSynced,
+  setIsSynced,
+  snapshotRef,
+  syncTimerRef,
+  historyCounter,
+}: {
+  pickerColor: HexColor;
+  setPickerColor: (hex: HexColor) => void;
+  cardState: PaletteCard;
+  actions: PaletteCardActions;
+  mode: PaletteMode;
+  isSynced: boolean;
+  setIsSynced: (v: boolean) => void;
+  snapshotRef: RefObject<PaletteCard | null>;
+  syncTimerRef: RefObject<Timeout | null>;
+  historyCounter: number;
+}) {
+  const selectedColor =
+    mode === "select"
+      ? null
+      : cardState.selectedColorIds.length === 1
+        ? cardState.colors.find((c) => c.id === cardState.selectedColorIds[0])
+        : null;
+  const wasSyncedRef = useRef(false);
+  const pickerColorValue = pickerColor.to_code();
+
+  // when sync toggles on, set picker <- palette
+  useEffect(() => {
+    if (!isSynced) {
+      wasSyncedRef.current = false;
+      return;
+    }
+
+    // handle toggle on
+    if (!wasSyncedRef.current) {
+      wasSyncedRef.current = true;
+
+      if (syncTimerRef.current) {
+        clearTimeout(syncTimerRef.current);
+        syncTimerRef.current = null;
+        if (snapshotRef.current) {
+          actions.commitToHistory(snapshotRef.current);
+          snapshotRef.current = null;
+        }
+      }
+
+      if (selectedColor) setPickerColor(selectedColor.hex);
+    }
+  }, [selectedColor?.id, isSynced]);
+
+  // during sync, set picker -> palette
+  useEffect(() => {
+    if (!isSynced || !selectedColor || !wasSyncedRef.current) return;
+
+    if (!snapshotRef.current) {
+      snapshotRef.current = cardState; // capture pre-change state once
+    }
+
+    actions.setColorValueSilent(selectedColor.id, pickerColor);
+
+    if (syncTimerRef.current) clearTimeout(syncTimerRef.current);
+    syncTimerRef.current = setTimeout(() => {
+      actions.commitToHistory(snapshotRef.current!);
+      snapshotRef.current = null;
+    }, SYNC_DELAY);
+  }, [pickerColorValue]);
+
+  // when selection changes, set picker <- palette
+  useEffect(() => {
+    if (!isSynced || !selectedColor) return;
+
+    if (syncTimerRef.current) {
+      clearTimeout(syncTimerRef.current);
+      syncTimerRef.current = null;
+      if (snapshotRef.current) {
+        snapshotRef.current = null;
+      }
+    }
+
+    setPickerColor(selectedColor.hex);
+  }, [selectedColor?.id]);
+
+  // undo/redo, set picker <- palette
+  useEffect(() => {
+    if (!isSynced || !selectedColor || !wasSyncedRef.current) return;
+
+    setPickerColor(selectedColor.hex);
+  }, [historyCounter]);
+
+  return (
+    <div className={styles.cardWrapper} data-cy="palette-card">
+      <SyncButton isSynced={isSynced} setIsSynced={setIsSynced} />
+      <CardHeader name={cardState.name} onNameChange={actions.setCardName} />
+      <PickerColor
+        pickerColor={pickerColor}
+        setPickerColor={setPickerColor}
+        selectedColor={selectedColor?.hex || null}
+        isSynced={isSynced}
+      />
+      <PaletteColor
+        selectedColor={selectedColor?.hex || null}
+        pickerColor={pickerColor}
+        paletteColorId={selectedColor?.id || null}
+        setPaletteColor={actions.setColorValue}
+        isSynced={isSynced}
+      />
+      <Palette cardState={cardState} actions={actions} mode={mode} />
+    </div>
+  );
+}
+
+function SyncButton({
+  isSynced,
+  setIsSynced,
+}: {
+  isSynced: boolean;
+  setIsSynced: (v: boolean) => void;
+}) {
+  return (
+    <div
+      className={styles.sync}
+      data-cy="sync"
+      onClick={() => setIsSynced(!isSynced)}
+      aria-pressed={isSynced}
+      style={{
+        color: isSynced ? "#292929" : "#7a7a7a",
+      }}
+      title={isSynced ? "Unsync Picker & Palette" : "Sync Picker and Palette"}
+    >
+      <span className={styles.leftSpan}>Picker</span>
+      <span className={styles.middleSpan}>
+        {isSynced ? <RefreshCw size={22} /> : <RefreshCwOff size={22} />}
+      </span>
+      <span className={styles.rightSpan}>Palette</span>
+    </div>
+  );
+}
+
+function CardHeader({
+  name,
+  onNameChange,
+}: {
+  name: string;
+  onNameChange: (name: string) => void;
+}) {
+  return (
+    <div className={styles.cardHeader} data-cy="card-header">
+      <EditableField
+        testID="card-name"
+        value={name}
+        setValue={onNameChange}
+        buttonSize={12}
+      />
+    </div>
+  );
+}
+
+function PickerColor({
+  pickerColor,
+  setPickerColor,
+  selectedColor,
+  isSynced,
+}: {
+  pickerColor: HexColor;
+  setPickerColor: (hex: HexColor) => void;
+  selectedColor: HexColor | null;
+  isSynced: boolean;
+}) {
+  const arrowToken = useContrastToken(() => luminanceFromHex(pickerColor));
+
+  const handleClick = () => {
+    if (!isSynced && selectedColor) {
+      setPickerColor(selectedColor);
+    }
+  };
+
+  return (
+    <div
+      className={clsx(styles.previewPane, styles.pickerColor)}
+      data-cy="picker-preview"
+      style={{
+        cursor: isSynced ? "unset" : "pointer",
+        backgroundColor: formatHexString(pickerColor),
+      }}
+      onClick={handleClick}
+      title={!isSynced ? "Set to Palette Color" : ""}
+    >
+      {!isSynced && (
+        <div
+          data-cy="picker-color-arrow"
+          className={clsx(styles.arrowIndicator, {
+            [styles.arrowIndicatorDark]: arrowToken === "dark",
+            [styles.arrowIndicatorLight]: arrowToken === "light",
+          })}
+        >
+          <ChevronsLeft size={32} />
+        </div>
+      )}
+    </div>
+  );
+}
+
+function PaletteColor({
+  selectedColor,
+  pickerColor,
+  paletteColorId,
+  setPaletteColor,
+  isSynced,
+}: {
+  selectedColor: HexColor | null;
+  pickerColor: HexColor;
+  paletteColorId: string | null;
+  setPaletteColor: (id: string, hex: HexColor) => void;
+  isSynced: boolean;
+}) {
+  const bgColor = selectedColor || DEFAULT_BG;
+  const arrowToken = useContrastToken(() => luminanceFromHex(bgColor));
+
+  const handleClick = () => {
+    if (!isSynced && paletteColorId) {
+      setPaletteColor(paletteColorId, pickerColor);
+    }
+  };
+
+  return (
+    <div
+      className={clsx(styles.previewPane, styles.paletteColor)}
+      data-cy="selected-preview"
+      style={{
+        cursor: isSynced ? "unset" : "pointer",
+        backgroundColor: formatHexString(bgColor),
+      }}
+      onClick={handleClick}
+      title={!isSynced ? "Set to Picker Color" : ""}
+    >
+      {!isSynced && (
+        <div
+          data-cy="palette-color-arrow"
+          className={clsx(styles.arrowIndicator, {
+            [styles.arrowIndicatorDark]: arrowToken === "dark",
+            [styles.arrowIndicatorLight]: arrowToken === "light",
+          })}
+        >
+          <ChevronsRight size={32} />
+        </div>
+      )}
+    </div>
+  );
+}
+
+function Palette({
+  cardState,
+  actions,
+  mode,
+}: {
+  cardState: PaletteCard;
+  actions: PaletteCardActions;
+  mode: PaletteMode;
+}) {
+  const {
+    containerRef,
+    setItemRef,
+    isDragging,
+    // sourceIndex,
+    targetIndex,
+    previewItems,
+  } = useDragAndDrop({
+    items: cardState.colors,
+    handleReorder: actions.reorderColors,
+    disabled: mode !== "reorder",
+  });
+
+  const handleNormalClick = (color: PaletteColor) => {
+    const ids = cardState.selectedColorIds;
+    const isSelected = ids.includes(color.id);
+    console.log(color.id, isSelected);
+    if (isSelected) {
+      actions.setSelectedColors([]);
+    } else {
+      actions.setSelectedColors([color.id]);
+    }
+  };
+
+  const handleSelectClick = (color: PaletteColor) => {
+    const ids = cardState.selectedColorIds;
+    const next = ids.includes(color.id)
+      ? ids.filter((id) => id !== color.id)
+      : [...ids, color.id];
+    actions.setSelectedColors(next);
+  };
+
+  const onRowClick =
+    mode === "normal"
+      ? handleNormalClick
+      : mode === "select"
+        ? handleSelectClick
+        : undefined;
+
+  const displayColors = isDragging ? previewItems : cardState.colors;
+
+  return (
+    <div className={styles.palette} data-cy="palette" ref={containerRef}>
+      {displayColors.length > 0 ? (
+        displayColors.map((color, index) => (
+          <PaletteRow
+            key={color.id}
+            color={color}
+            index={index}
+            isSelected={cardState.selectedColorIds.includes(color.id)}
+            isEditable={
+              mode === "normal" && cardState.selectedColorIds[0] === color.id
+            }
+            isDragging={isDragging}
+            mode={mode}
+            actions={actions}
+            onRowClick={onRowClick}
+            setItemRef={setItemRef}
+            targetIndex={targetIndex}
+          />
+        ))
+      ) : (
+        <span style={{ margin: 8 }}>
+          No colors in palette. Press{" "}
+          <Plus size={16} style={{ transform: "translateY(2px)" }} /> in the
+          toolbar above to add one.
+        </span>
+      )}
+    </div>
+  );
+}
+
+function PaletteRow({
+  color,
+  index,
+  isSelected,
+  isEditable,
+  isDragging,
+  mode,
+  actions,
+  onRowClick,
+  setItemRef,
+  targetIndex,
+}: {
+  color: PaletteColor;
+  index: number;
+  isSelected: boolean;
+  isEditable: boolean;
+  isDragging: boolean;
+  mode: PaletteMode;
+  actions: PaletteCardActions;
+  onRowClick?: (color: PaletteColor, e: MouseEvent<HTMLDivElement>) => void;
+  setItemRef: (el: HTMLElement | null, id: string) => void;
+  targetIndex: number;
+}) {
+  const isNormalMode = mode === "normal";
+  const isSelectMode = mode === "select";
+  const isReorderMode = mode === "reorder";
+
+  const Wrapper = isReorderMode ? motion.div : "div";
+  const motionProps = isReorderMode
+    ? { layout: true, transition: { duration: 0.25 } }
+    : {};
+
+  const token = useContrastToken(() => luminanceFromHex(color.hex));
+
+  return (
+    <Wrapper
+      className={clsx(styles.paletteRowWrapper, {
+        [styles.draggable]: isReorderMode,
+        [styles.dragging]: isDragging && index === targetIndex,
+        [styles.multiSelected]: isSelectMode && isSelected,
+      })}
+      ref={(el) => setItemRef(el, color.id)}
+      data-cy={`palette-row-${index}-wrapper`}
+      data-item-id={color.id}
+      onClick={(e) => onRowClick?.(color, e)}
+      {...motionProps}
+    >
+      <div
+        className={styles.paletteRow}
+        data-cy={`palette-row-${index}`}
+        aria-selected={isSelected}
+        style={{
+          backgroundColor: formatHexString(color.hex),
+        }}
+      >
+        {isSelectMode && (
+          <span
+            className={clsx(styles.modeDecorator, styles.checkDecorator, {
+              [styles.checkDecoratorSelected]: isSelected,
+              [styles.checkDecoratorDark]: token === "dark",
+              [styles.checkDecoratorLight]: token === "light",
+            })}
+          >
+            {isSelected && <Check size={18} strokeWidth={3} />}
+          </span>
+        )}
+        {mode === "reorder" && (
+          <span
+            className={clsx(styles.modeDecorator, {
+              [styles.gripDark]: token === "dark",
+              [styles.gripLight]: token === "light",
+            })}
+          >
+            <GripVertical size={24} />
+          </span>
+        )}
+        {isNormalMode &&
+          (isSelected ? (
+            <Crosshair
+              className={clsx(styles.selectedIndicator, {
+                [styles.indicatorDark]: token === "dark",
+                [styles.indicatorLight]: token === "light",
+              })}
+              size={27}
+            >
+              <Dot />
+            </Crosshair>
+          ) : (
+            <CircleDashed
+              className={clsx(styles.targettedIndicator, {
+                [styles.indicatorDark]: token === "dark",
+                [styles.indicatorLight]: token === "light",
+              })}
+              size={32}
+            />
+          ))}
+        <div className={styles.paletteRowData}>
+          <div className={styles.colorName}>
+            {isEditable ? (
+              <EditableField
+                testID={`palette-row-name-${index}`}
+                value={color.name}
+                setValue={(newName: string) =>
+                  actions.setColorName(color.id, newName)
+                }
+                buttonSize={12}
+                contrastToken={token}
+                reset={!isSelected}
+              />
+            ) : (
+              <div>
+                <span
+                  data-cy={`palette-row-name-${index}`}
+                  className={clsx(styles.field, {
+                    [styles.fieldDark]: token === "dark",
+                    [styles.fieldLight]: token === "light",
+                  })}
+                >
+                  {color.name}
+                </span>
+              </div>
+            )}
+          </div>
+          <div className={styles.colorHex}>
+            {isEditable ? (
+              <EditableField
+                testID={`palette-row-hex-${index}`}
+                value={color.hex.to_code()}
+                setValue={(newHex: string) =>
+                  actions.setColorValue(color.id, HexColor.from_code(newHex))
+                }
+                buttonSize={12}
+                contrastToken={token}
+                reset={!isSelected}
+                validate={(raw: string) => extractHexValue(raw)}
+                render={(raw: string) => `#${raw}`}
+              />
+            ) : (
+              <div className={styles.fieldWrapper}>
+                <span
+                  data-cy={`palette-row-hex-${index}`}
+                  className={clsx(styles.field, {
+                    [styles.fieldDark]: token === "dark",
+                    [styles.fieldLight]: token === "light",
+                  })}
+                >
+                  {formatHexString(color.hex)}
+                </span>
+              </div>
+            )}
+          </div>
+        </div>
+      </div>
+    </Wrapper>
+  );
+}
+
+function EditableField({
+  testID,
+  value,
+  setValue,
+  buttonSize,
+  contrastToken,
+  reset,
+  validate,
+  render,
+}: {
+  testID: string;
+  value: string;
+  setValue: (v: string) => void;
+  buttonSize: number;
+  contrastToken?: ContrastToken;
+  reset?: boolean;
+  validate?: (raw: string) => string | null;
+  render?: (raw: string) => string;
+}) {
+  const [isEditing, setIsEditing] = useState(false);
+  const spanRef = useRef<HTMLSpanElement>(null);
+
+  useEffect(() => {
+    if (reset) setIsEditing(false);
+  }, [reset]);
+
+  useEffect(() => {
+    // return if not editing or not rendered
+    if (!isEditing || !spanRef.current) return;
+
+    // set span content
+    spanRef.current.textContent = render ? render(value) : value;
+
+    // focus span
+    spanRef.current.focus();
+
+    // select contents
+    const range = document.createRange();
+    range.selectNodeContents(spanRef.current);
+    window.getSelection()?.removeAllRanges();
+    window.getSelection()?.addRange(range);
+  }, [isEditing, value, render]);
+
+  const onConfirm = () => {
+    const raw = spanRef.current?.textContent ?? "";
+    const validated = validate ? validate(raw) : raw;
+    if (validated) setValue(validated);
+    setIsEditing(false);
+  };
+
+  const onCancel = () => {
+    window.getSelection()?.removeAllRanges();
+    setIsEditing(false);
+  };
+
+  const handleKeyDown = (e: KeyboardEvent) => {
+    if (e.key === "Escape") {
+      e.preventDefault();
+      onCancel();
+    } else if (e.key === "Enter") {
+      e.preventDefault();
+      onConfirm();
+    }
+  };
+
+  return (
+    <div className={styles.editableFieldWrapper}>
+      <div className={styles.valueWrapper}>
+        <span
+          ref={spanRef}
+          data-cy={isEditing ? `${testID}-input` : testID}
+          className={clsx(styles.editableField, {
+            [styles.editingField]: isEditing,
+            [styles.editableFieldDark]: contrastToken === "dark",
+            [styles.editableFieldLight]: contrastToken === "light",
+          })}
+          contentEditable={isEditing}
+          suppressContentEditableWarning
+          onClick={(e) => e.stopPropagation()}
+          onKeyDown={isEditing ? handleKeyDown : undefined}
+        >
+          {!isEditing && (render ? render(value) : value)}
+        </span>
+      </div>
+      {isEditing ? (
+        <div>
+          <button
+            data-cy={`${testID}-cancel`}
+            className={clsx(styles.editableFieldButton, {
+              [styles.editableFieldButtonDark]: contrastToken === "dark",
+              [styles.editableFieldButtonLight]: contrastToken === "light",
+            })}
+            onClick={(e) => {
+              e.stopPropagation();
+              onCancel();
+            }}
+            title="Cancel"
+          >
+            <X size={buttonSize} strokeWidth={3} />
+          </button>
+          <button
+            data-cy={`${testID}-confirm`}
+            className={clsx(styles.editableFieldButton, {
+              [styles.editableFieldButtonDark]: contrastToken === "dark",
+              [styles.editableFieldButtonLight]: contrastToken === "light",
+            })}
+            onClick={(e) => {
+              e.stopPropagation();
+              onConfirm();
+            }}
+            title="Confirm"
+          >
+            <Check size={buttonSize} strokeWidth={3} />
+          </button>
+        </div>
+      ) : (
+        <div>
+          <button
+            data-cy={`${testID}-edit`}
+            className={clsx(styles.editableFieldButton, {
+              [styles.editableFieldButtonDark]: contrastToken === "dark",
+              [styles.editableFieldButtonLight]: contrastToken === "light",
+            })}
+            onClick={(e) => {
+              e.stopPropagation();
+              setIsEditing(true);
+            }}
+            title="Edit"
+          >
+            <Pencil size={buttonSize} strokeWidth={3} />
+          </button>
+        </div>
+      )}
+    </div>
+  );
+}
+
+export default PaletteEditor;

src/hooks/color.ts

@@ -24,34 +24,34 @@ export function colorReducer(
   state: ColorState,
   action: ColorAction,
 ): ColorState {
-  let comp;
+  let comp, rgb, hsv, hcl, hex, valOrFn, prev;
 
   switch (action.type) {
     case "SET_COLOR":
       return { ...state, color: action.payload };
 
     case "SET_RGB":
-      let rgb = action.payload;
+      rgb = action.payload;
       return { ...state, color: colorlib.Color.from_rgb(rgb.r, rgb.g, rgb.b) };
 
     case "SET_HSV":
-      let hsv = action.payload;
+      hsv = action.payload;
       return { ...state, color: colorlib.Color.from_hsv(hsv.h, hsv.s, hsv.v) };
 
     case "SET_HCL":
-      let hcl = action.payload;
+      hcl = action.payload;
       return { ...state, color: colorlib.Color.from_hcl(hcl.h, hcl.c, hcl.l) };
 
     case "SET_HEX":
-      let hex = action.payload;
+      hex = action.payload;
       return { ...state, color: colorlib.Color.from_hex(hex.to_code()) };
 
     case "SET_VALUE":
       comp = action.component;
-      let valOrFn = action.payload;
+      valOrFn = action.payload;
 
       if (typeof valOrFn === "function") {
-        let prev = state.color.get(comp);
+        prev = state.color.get(comp);
         return { ...state, color: state.color.update(comp, valOrFn(prev)) };
       } else {
         return { ...state, color: state.color.update(comp, valOrFn) };

src/hooks/contrast.ts

@@ -0,0 +1,20 @@
+import { useMemo } from "react";
+
+import * as colorlib from "colorlib";
+
+export type ContrastToken = "dark" | "light";
+
+export function contrastToken(l: number, threshold = 0.5): ContrastToken {
+  return l < threshold ? "light" : "dark";
+}
+
+export function luminanceFromHex(hex: colorlib.Hex): number {
+  return colorlib.HCL.from_hex(hex.to_code()).l;
+}
+
+export function useContrastToken(getLuminance: () => number, threshold = 0.5) {
+  return useMemo(
+    () => contrastToken(getLuminance(), threshold),
+    [getLuminance, threshold],
+  );
+}

src/hooks/crosshair.tsx

@@ -12,7 +12,7 @@ import {
 import { useSmoothAnimation } from "./animation";
 
 if (typeof TouchEvent === "undefined") {
-  // @ts-ignore - intentionally creating global
+  // @ts-expect-error - intentionally creating global
   window.TouchEvent = window.MouseEvent;
 }
 
@@ -61,7 +61,8 @@ export function useCrosshair({
     yValueRangeRef.current = yValueRange;
   }, [xValueRange, yValueRange]);
 
-  const calculatePositions = useCallback((event: MouseEvent | TouchEvent) => {
+  const calculatePositions = useCallback(
+    (event: MouseEvent | TouchEvent) => {
       const orig = originRef.current;
       const dims = dimensionsRef.current;
       const xRange = xValueRangeRef.current;
@@ -84,14 +85,16 @@ export function useCrosshair({
 
       setXValueRef.current(newXValue);
       setYValueRef.current(newYValue);
-  }, []);
+    },
+    [invertX, invertY],
+  );
 
   const handleMove = useCallback(
     (event: MouseEvent | TouchEvent) => {
       event.preventDefault();
       smoothAnimation(() => calculatePositions(event));
     },
-    [calculatePositions],
+    [calculatePositions, smoothAnimation],
   );
 
   const handleEnd = useCallback(

src/hooks/dragAndDrop.tsx

@@ -22,9 +22,11 @@ interface DragState<T> {
 }
 
 function reducer<T>(state: DragState<T>, action: DragAction<T>) {
+  let items, cursor, rects, newTargetIndex, newPreviewItems, movedItem;
+
   switch (action.type) {
     case "resetItems":
-      const items = action.items;
+      items = action.items;
       return {
         ...state,
         items: [...items],
@@ -44,8 +46,9 @@ function reducer<T>(state: DragState<T>, action: DragAction<T>) {
     case "processMove":
       if (!state.isDragging) return state;
 
-      const { cursor, rects } = action;
-      let newTargetIndex = state.targetIndex;
+      cursor = action.cursor;
+      rects = action.rects;
+      newTargetIndex = state.targetIndex;
 
       for (let i = 0; i < rects.length; i++) {
         const rect = rects[i];
@@ -62,8 +65,8 @@ function reducer<T>(state: DragState<T>, action: DragAction<T>) {
 
       if (newTargetIndex === state.targetIndex) return state;
 
-      const newPreviewItems = [...state.items];
-      const [movedItem] = newPreviewItems.splice(state.sourceIndex, 1);
+      newPreviewItems = [...state.items];
+      [movedItem] = newPreviewItems.splice(state.sourceIndex, 1);
       newPreviewItems.splice(newTargetIndex, 0, movedItem);
 
       return {
@@ -136,18 +139,21 @@ export function useDragAndDrop<T extends { id: string }>({
     return itemElement;
   }
 
-  function getItemIndex(el: HTMLElement) {
+  const getItemIndex = useCallback(
+    (el: HTMLElement) => {
       const itemId = el.dataset.itemId;
       const index = items.findIndex((item) => item.id === itemId);
       return index;
-  }
+    },
+    [items],
+  );
 
-  function captureItemBoundaries() {
+  const captureItemBoundaries = useCallback(() => {
     itemBoundingRects.current = items.map((item) => {
       const el = itemRefs.current[item.id]?.current;
       return el ? el.getBoundingClientRect() : new DOMRect();
     });
-  }
+  }, [itemRefs, items]);
 
   const handleDragMove = useCallback(
     (event: MouseEvent | TouchEvent) => {
@@ -195,7 +201,14 @@ export function useDragAndDrop<T extends { id: string }>({
       document.addEventListener("touchend", handleDragEnd);
       document.addEventListener("touchcancel", handleDragEnd);
     },
-    [items, dispatch, handleDragEnd, handleDragMove],
+    [
+      items,
+      dispatch,
+      handleDragEnd,
+      handleDragMove,
+      captureItemBoundaries,
+      getItemIndex,
+    ],
   );
 
   // Set/cleanup event handlers
@@ -221,7 +234,7 @@ export function useDragAndDrop<T extends { id: string }>({
         });
       };
     }
-  }, [items, handleDragStart, disabled]);
+  }, [items, handleDragStart, disabled, itemRefs]);
 
   return {
     containerRef,

src/hooks/hex.ts

@@ -0,0 +1,25 @@
+import * as colorlib from "colorlib";
+
+export const extractHexValue = (value: string): string | null => {
+  const match = value.match(/^#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})$/);
+  return match ? match[1] : null;
+};
+
+export const formatHexString = (
+  color: colorlib.Hex,
+  preserveShortFormat: boolean = false,
+): string => {
+  const hexValue = color.to_code();
+
+  if (preserveShortFormat) {
+    if (
+      hexValue[0] === hexValue[1] &&
+      hexValue[2] === hexValue[3] &&
+      hexValue[4] === hexValue[5]
+    ) {
+      return `#${hexValue[0]}${hexValue[2]}${hexValue[4]}`;
+    }
+  }
+
+  return `#${color.to_code()}`;
+};

src/hooks/paletteCard.ts

@@ -0,0 +1,248 @@
+import type { Dispatch } from "react";
+
+import { Hex as HexColor } from "colorlib";
+
+import { randomId } from "@/util";
+
+export type PaletteMode = "normal" | "select" | "reorder";
+
+export interface PaletteColor {
+  id: string;
+  name: string;
+  hex: HexColor;
+}
+
+export interface ColorNameUpdate {
+  id: string;
+  name: string;
+}
+
+export interface ColorValueUpdate {
+  id: string;
+  hex: HexColor;
+}
+
+export interface PaletteCard {
+  id: string;
+  name: string;
+  colors: PaletteColor[];
+  selectedColorIds: string[];
+}
+
+export interface PaletteCardState {
+  present: PaletteCard;
+  history: PaletteCard[];
+  future: PaletteCard[];
+}
+
+export type PaletteCardAction =
+  | { type: "SET_CARD_NAME"; payload: string }
+  | { type: "SET_COLOR_NAME"; payload: ColorNameUpdate }
+  | { type: "SET_COLOR_VALUE"; payload: ColorValueUpdate }
+  | { type: "SET_COLOR_VALUE_SILENT"; payload: ColorValueUpdate }
+  | { type: "COMMIT_TO_HISTORY"; payload: PaletteCard }
+  | { type: "SET_SELECTED_COLORS"; payload: string[] }
+  | { type: "SELECT_ALL" }
+  | { type: "CLEAR_SELECTION" }
+  | { type: "DELETE_SELECTED_COLORS" }
+  | { type: "DUPLICATE_SELECTED_COLORS" }
+  | { type: "ADD_COLOR" }
+  | { type: "REORDER_COLORS"; payload: PaletteColor[] }
+  | { type: "UNDO" }
+  | { type: "REDO" };
+
+const pushToHistory = (state: PaletteCardState, newPresent: PaletteCard) => {
+  return {
+    ...state,
+    history: [state.present, ...state.history],
+    future: [],
+    present: newPresent,
+  };
+};
+
+export function paletteCardReducer(
+  state: PaletteCardState,
+  action: PaletteCardAction,
+): PaletteCardState {
+  switch (action.type) {
+    case "SET_CARD_NAME":
+      state = pushToHistory(state, { ...state.present, name: action.payload });
+      return state;
+
+    case "SET_COLOR_NAME": {
+      let changed = false;
+      const colors = state.present.colors.map((c) => {
+        if (c.id !== action.payload.id) return c;
+        changed = true;
+        return { ...c, name: action.payload.name };
+      });
+      if (!changed) return state;
+      return pushToHistory(state, { ...state.present, colors });
+    }
+
+    case "SET_COLOR_VALUE": {
+      let changed = false;
+      const colors = state.present.colors.map((c) => {
+        if (c.id !== action.payload.id) return c;
+        changed = true;
+        return { ...c, hex: action.payload.hex };
+      });
+      if (!changed) return state;
+      return pushToHistory(state, { ...state.present, colors });
+    }
+
+    case "SET_COLOR_VALUE_SILENT": {
+      let changed = false;
+      const colors = state.present.colors.map((c) => {
+        if (c.id !== action.payload.id) return c;
+        changed = true;
+        return { ...c, hex: action.payload.hex };
+      });
+      if (!changed) return state;
+      return {
+        ...state,
+        present: { ...state.present, colors },
+      };
+    }
+
+    case "COMMIT_TO_HISTORY": {
+      return {
+        ...state,
+        history: [action.payload, ...state.history],
+      };
+    }
+
+    case "SET_SELECTED_COLORS":
+      return {
+        ...state,
+        present: { ...state.present, selectedColorIds: action.payload },
+      };
+
+    case "SELECT_ALL":
+      return {
+        ...state,
+        present: {
+          ...state.present,
+          selectedColorIds: state.present.colors.map((c) => c.id),
+        },
+      };
+
+    case "CLEAR_SELECTION":
+      return {
+        ...state,
+        present: { ...state.present, selectedColorIds: [] },
+      };
+
+    case "ADD_COLOR": {
+      const newColor: PaletteColor = {
+        id: randomId(),
+        name: "New Color",
+        hex: HexColor.from_code("000000"),
+      };
+      return pushToHistory(state, {
+        ...state.present,
+        colors: [...state.present.colors, newColor],
+      });
+    }
+
+    case "DELETE_SELECTED_COLORS": {
+      if (state.present.selectedColorIds.length === 0) return state;
+      const ids = new Set(state.present.selectedColorIds);
+      return pushToHistory(state, {
+        ...state.present,
+        colors: state.present.colors.filter((c) => !ids.has(c.id)),
+        selectedColorIds: [],
+      });
+    }
+
+    case "DUPLICATE_SELECTED_COLORS": {
+      if (state.present.selectedColorIds.length === 0) return state;
+      const ids = new Set(state.present.selectedColorIds);
+      const next: PaletteColor[] = [];
+      for (const color of state.present.colors) {
+        next.push(color);
+        if (ids.has(color.id)) {
+          next.push({ ...color, id: randomId() });
+        }
+      }
+      return pushToHistory(state, {
+        ...state.present,
+        colors: next,
+      });
+    }
+
+    case "REORDER_COLORS":
+      return pushToHistory(state, {
+        ...state.present,
+        colors: action.payload,
+      });
+
+    case "UNDO": {
+      if (state.history.length === 0) return state;
+      const [prev, ...rest] = state.history;
+      return {
+        present: prev,
+        history: rest,
+        future: [state.present, ...state.future],
+      };
+    }
+
+    case "REDO": {
+      if (state.future.length === 0) return state;
+      const [next, ...rest] = state.future;
+      return {
+        present: next,
+        history: [state.present, ...state.history],
+        future: rest,
+      };
+    }
+
+    default:
+      return state;
+  }
+}
+
+export interface PaletteCardActions {
+  setCardName: (name: string) => void;
+  setColorName: (id: string, name: string) => void;
+  setColorValue: (id: string, hex: HexColor) => void;
+  setColorValueSilent: (id: string, hex: HexColor) => void;
+  commitToHistory: (card: PaletteCard) => void;
+  setSelectedColors: (id: string[]) => void;
+  selectAll: () => void;
+  clearSelection: () => void;
+  addColor: () => void;
+  deleteSelectedColors: () => void;
+  duplicateSelectedColors: () => void;
+  reorderColors: (colors: PaletteColor[]) => void;
+  undo: () => void;
+  redo: () => void;
+}
+
+export function createPaletteCardActions(
+  dispatch: Dispatch<PaletteCardAction>,
+): PaletteCardActions {
+  return {
+    setCardName: (name) => dispatch({ type: "SET_CARD_NAME", payload: name }),
+    setColorName: (id, name) =>
+      dispatch({ type: "SET_COLOR_NAME", payload: { id, name } }),
+    setColorValue: (id, hex) =>
+      dispatch({ type: "SET_COLOR_VALUE", payload: { id, hex } }),
+    setColorValueSilent: (id, hex) =>
+      dispatch({ type: "SET_COLOR_VALUE_SILENT", payload: { id, hex } }),
+    commitToHistory: (card) =>
+      dispatch({ type: "COMMIT_TO_HISTORY", payload: card }),
+    setSelectedColors: (ids) =>
+      dispatch({ type: "SET_SELECTED_COLORS", payload: ids }),
+    selectAll: () => dispatch({ type: "SELECT_ALL" }),
+    clearSelection: () => dispatch({ type: "CLEAR_SELECTION" }),
+    addColor: () => dispatch({ type: "ADD_COLOR" }),
+    deleteSelectedColors: () => dispatch({ type: "DELETE_SELECTED_COLORS" }),
+    duplicateSelectedColors: () =>
+      dispatch({ type: "DUPLICATE_SELECTED_COLORS" }),
+    reorderColors: (colors) =>
+      dispatch({ type: "REORDER_COLORS", payload: colors }),
+    undo: () => dispatch({ type: "UNDO" }),
+    redo: () => dispatch({ type: "REDO" }),
+  };
+}

src/hooks/slider.tsx

@@ -16,7 +16,7 @@ import { useSmoothAnimation } from "./animation";
 import { useScroll } from "./scroll";
 
 if (typeof TouchEvent === "undefined") {
-  // @ts-ignore - intentionally creating global
+  // @ts-expect-error - intentionally creating global
   window.TouchEvent = window.MouseEvent;
 }
 
@@ -59,7 +59,11 @@ export function useSlider({
   const maxPosition = useRef(0);
 
   // Internal position management
-  const [position, setPosition] = useState(0);
+  const position = valueToPosition(
+    value,
+    chooseValueByDirection(direction, dimensions.x, dimensions.y),
+    valueRange,
+  );
   const positionRef = useRef(position);
 
   // Hooks
@@ -79,11 +83,11 @@ export function useSlider({
       maxPosition.current,
       valueRangeRef.current,
     );
-  }, [direction, origin, dimensions]);
+  }, [direction, origin, dimensions, value]);
 
   useEffect(() => {
     valueRangeRef.current = valueRange;
-  }, [valueRangeRef]);
+  }, [valueRange, valueRangeRef]);
 
   useEffect(() => {
     setValueRef.current = setValue;
@@ -94,7 +98,8 @@ export function useSlider({
   }, [position]);
 
   // Setup drag handlers
-  const calculatePosition = useCallback((event: MouseEvent | TouchEvent) => {
+  const calculatePosition = useCallback(
+    (event: MouseEvent | TouchEvent) => {
       const dir = directionRef.current;
       const orig = originRef.current;
       const dims = dimensionsRef.current;
@@ -116,14 +121,16 @@ export function useSlider({
       }
 
       setValueRef.current(newValue);
-  }, []);
+    },
+    [invert],
+  );
 
   const handleMove = useCallback(
     (event: MouseEvent | TouchEvent) => {
       event.preventDefault();
       smoothAnimation(() => calculatePosition(event));
     },
-    [calculatePosition],
+    [calculatePosition, smoothAnimation],
   );
 
   const handleEnd = useCallback(() => {
@@ -198,15 +205,6 @@ export function useSlider({
     onScrollDown: handleScrollDown,
   });
 
-  useEffect(() => {
-    const newPosition = valueToPosition(
-      value,
-      maxPosition.current,
-      valueRangeRef.current,
-    );
-    setPosition(newPosition);
-  }, [value, setPosition]);
-
   // Set up entry listeners
   useEffect(() => {
     const currentRef = sliderRef.current;

src/hooks/storage.ts

@@ -0,0 +1,70 @@
+import { Hex as HexColor } from "colorlib";
+
+import type { PaletteCard, PaletteColor } from "./paletteCard";
+
+const CARDS_KEY = "luminance:cards";
+const ACTIVE_ID_KEY = "luminance:activeCardId";
+
+interface SerializedColor {
+  id: string;
+  name: string;
+  hex: string;
+}
+interface SerializedCard {
+  id: string;
+  name: string;
+  colors: SerializedColor[];
+}
+
+function serializeColor(color: PaletteColor): SerializedColor {
+  return {
+    id: color.id,
+    name: color.name,
+    hex: color.hex.to_code(),
+  };
+}
+
+function deserializeColor(raw: SerializedColor): PaletteColor {
+  return {
+    id: raw.id,
+    name: raw.name,
+    hex: HexColor.from_code(raw.hex),
+  };
+}
+
+export function serializeCard(card: PaletteCard): SerializedCard {
+  return {
+    id: card.id,
+    name: card.name,
+    colors: card.colors.map(serializeColor),
+  };
+}
+
+export function deserializeCard(raw: SerializedCard): PaletteCard {
+  return {
+    id: raw.id,
+    name: raw.name,
+    colors: raw.colors.map(deserializeColor),
+    selectedColorIds: [],
+  };
+}
+
+export function loadCards(): Record<string, SerializedCard> {
+  try {
+    return JSON.parse(localStorage.getItem(CARDS_KEY) ?? "{}");
+  } catch {
+    return {};
+  }
+}
+
+export function saveCards(cards: Record<string, SerializedCard>) {
+  localStorage.setItem(CARDS_KEY, JSON.stringify(cards));
+}
+
+export function loadActiveCardId(): string | null {
+  return localStorage.getItem(ACTIVE_ID_KEY);
+}
+
+export function saveActiveCardId(id: string): void {
+  localStorage.setItem(ACTIVE_ID_KEY, id);
+}

src/hooks/tests/color.test.ts

@@ -1,44 +1,11 @@
 import * as colorlib from "colorlib";
 import { beforeEach, describe, expect, test } from "vitest";
 
+import { expectEqualColor, mockUseReducer } from "@/testUtil";
+
 import { colorReducer, createColorActions } from "../color";
 import type { ColorAction, ColorActions, ColorState } from "../color";
 
-const mockUseReducer = <T extends object, U>(
-  reducer: (state: T, action: U) => T,
-  initialArg: T,
-): [T, (value: U) => void] => {
-  let currentState = initialArg;
-
-  const state = new Proxy({} as T, {
-    get: (_, prop) => currentState[prop as keyof T],
-  });
-
-  const dispatch = (value: U) => {
-    const nextState = reducer(currentState, value);
-    currentState = nextState;
-  };
-  return [state, dispatch];
-};
-
-const expectRGB = (value: colorlib.RGB, expected: colorlib.RGB) => {
-  expect(value.r).toBe(expected.r);
-  expect(value.g).toBe(expected.g);
-  expect(value.b).toBe(expected.b);
-};
-
-const expectHSV = (value: colorlib.HSV, expected: colorlib.HSV) => {
-  expect(value.h).toBe(expected.h);
-  expect(value.s).toBe(expected.s);
-  expect(value.v).toBe(expected.v);
-};
-
-const expectHCL = (value: colorlib.HCL, expected: colorlib.HCL) => {
-  expect(value.h).toBe(expected.h);
-  expect(value.c).toBe(expected.c);
-  expect(value.l).toBe(expected.l);
-};
-
 describe("color reducer", () => {
   const initialState = { color: colorlib.Color.from_hex("000") };
 
@@ -61,7 +28,7 @@ describe("color reducer", () => {
         payload: nextColor,
       });
 
-      expectRGB(nextState.color.rgb, nextColor);
+      expectEqualColor(nextState.color.rgb, nextColor);
     });
 
     test("set hsv", () => {
@@ -71,7 +38,7 @@ describe("color reducer", () => {
         payload: nextColor,
       });
 
-      expectHSV(nextState.color.hsv, nextColor);
+      expectEqualColor(nextState.color.hsv, nextColor);
     });
 
     test("set hcl", () => {
@@ -81,7 +48,7 @@ describe("color reducer", () => {
         payload: nextColor,
       });
 
-      expectHCL(nextState.color.hcl, nextColor);
+      expectEqualColor(nextState.color.hcl, nextColor);
     });
 
     test("set hex", () => {
@@ -104,7 +71,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_R,
           payload: nextColor.r,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
 
       test("set rgb g", () => {
@@ -114,7 +81,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_G,
           payload: nextColor.g,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
 
       test("set rgb b", () => {
@@ -124,7 +91,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_B,
           payload: nextColor.b,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
     });
 
@@ -136,7 +103,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_H,
           payload: nextColor.h,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
 
       test("set hsv s", () => {
@@ -146,7 +113,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_S,
           payload: nextColor.s,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
 
       test("set hsv v", () => {
@@ -156,7 +123,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_V,
           payload: nextColor.v,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
     });
 
@@ -168,7 +135,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_H,
           payload: nextColor.h,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
 
       test("set hcl c", () => {
@@ -178,7 +145,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_C,
           payload: nextColor.c,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
 
       test("set hcl l", () => {
@@ -188,7 +155,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_L,
           payload: nextColor.l,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
     });
   });
@@ -202,7 +169,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_R,
           payload: (prev) => prev + 100,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(50, 0, 0);
         nextState = colorReducer(nextState, {
@@ -210,7 +177,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_R,
           payload: (prev) => prev - 50,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
 
       test("adjust rgb g", () => {
@@ -220,7 +187,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_G,
           payload: (prev) => prev + 100,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(0, 50, 0);
         nextState = colorReducer(nextState, {
@@ -228,7 +195,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_G,
           payload: (prev) => prev - 50,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
 
       test("adjust rgb b", () => {
@@ -238,7 +205,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_B,
           payload: (prev) => prev + 100,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(0, 0, 50);
         nextState = colorReducer(nextState, {
@@ -246,7 +213,7 @@ describe("color reducer", () => {
           component: colorlib.Component.RGB_B,
           payload: (prev) => prev - 50,
         });
-        expectRGB(nextState.color.rgb, nextColor);
+        expectEqualColor(nextState.color.rgb, nextColor);
       });
     });
 
@@ -258,7 +225,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_H,
           payload: (prev) => prev + 100,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(50, 0, 0);
         nextState = colorReducer(nextState, {
@@ -266,7 +233,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_H,
           payload: (prev) => prev - 50,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
 
       test("adjust hsv s", () => {
@@ -276,7 +243,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_S,
           payload: (prev) => prev + 1,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(0, 0.5, 0);
         nextState = colorReducer(nextState, {
@@ -284,7 +251,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_S,
           payload: (prev) => prev - 0.5,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
 
       test("adjust hsv v", () => {
@@ -294,7 +261,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_V,
           payload: (prev) => prev + 1,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(0, 0, 0.5);
         nextState = colorReducer(nextState, {
@@ -302,7 +269,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HSV_V,
           payload: (prev) => prev - 0.5,
         });
-        expectHSV(nextState.color.hsv, nextColor);
+        expectEqualColor(nextState.color.hsv, nextColor);
       });
     });
 
@@ -314,7 +281,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_H,
           payload: (prev) => prev + 100,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(50, 0, 0);
         nextState = colorReducer(nextState, {
@@ -322,7 +289,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_H,
           payload: (prev) => prev - 50,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
 
       test("adjust hcl c", () => {
@@ -332,7 +299,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_C,
           payload: (prev) => prev + 1,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(0, 0.5, 0);
         nextState = colorReducer(nextState, {
@@ -340,7 +307,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_C,
           payload: (prev) => prev - 0.5,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
 
       test("adjust hcl l", () => {
@@ -350,7 +317,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_L,
           payload: (prev) => prev + 1,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(0, 0, 0.5);
         nextState = colorReducer(nextState, {
@@ -358,7 +325,7 @@ describe("color reducer", () => {
           component: colorlib.Component.HCL_L,
           payload: (prev) => prev - 0.5,
         });
-        expectHCL(nextState.color.hcl, nextColor);
+        expectEqualColor(nextState.color.hcl, nextColor);
       });
     });
   });
@@ -388,19 +355,19 @@ describe("color actions", () => {
     test("set rgb", () => {
       const nextColor = colorlib.RGB.new(1, 2, 3);
       actions.rgb.setRGB(nextColor);
-      expectRGB(state.color.rgb, nextColor);
+      expectEqualColor(state.color.rgb, nextColor);
     });
 
     test("set hsv", () => {
       const nextColor = colorlib.HSV.new(1, 2, 3);
       actions.hsv.setHSV(nextColor);
-      expectHSV(state.color.hsv, nextColor);
+      expectEqualColor(state.color.hsv, nextColor);
     });
 
     test("set hcl", () => {
       const nextColor = colorlib.HCL.new(1, 2, 3);
       actions.hcl.setHCL(nextColor);
-      expectHCL(state.color.hcl, nextColor);
+      expectEqualColor(state.color.hcl, nextColor);
     });
 
     test("set hex", () => {
@@ -415,19 +382,19 @@ describe("color actions", () => {
       test("set rgb r", () => {
         const nextColor = colorlib.RGB.new(100, 0, 0);
         actions.rgb.setR(nextColor.r);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
 
       test("set rgb g", () => {
         const nextColor = colorlib.RGB.new(0, 100, 0);
         actions.rgb.setG(nextColor.g);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
 
       test("set rgb b", () => {
         const nextColor = colorlib.RGB.new(0, 0, 100);
         actions.rgb.setB(nextColor.b);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
     });
 
@@ -435,19 +402,19 @@ describe("color actions", () => {
       test("set hsv h", () => {
         const nextColor = colorlib.HSV.new(100, 0, 0);
         actions.hsv.setH(nextColor.h);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
 
       test("set hsv s", () => {
         const nextColor = colorlib.HSV.new(0, 0.5, 0);
         actions.hsv.setS(nextColor.s);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
 
       test("set hsv v", () => {
         const nextColor = colorlib.HSV.new(0, 0, 0.5);
         actions.hsv.setV(nextColor.v);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
     });
 
@@ -455,19 +422,19 @@ describe("color actions", () => {
       test("set hcl h", () => {
         const nextColor = colorlib.HCL.new(100, 0, 0);
         actions.hcl.setH(nextColor.h);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
 
       test("set hcl c", () => {
         const nextColor = colorlib.HCL.new(0, 0.5, 0);
         actions.hcl.setC(nextColor.c);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
 
       test("set hcl l", () => {
         const nextColor = colorlib.HCL.new(0, 0, 0.5);
         actions.hcl.setL(nextColor.l);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
     });
   });
@@ -477,31 +444,31 @@ describe("color actions", () => {
       test("adjust rgb r", () => {
         let nextColor = colorlib.RGB.new(100, 0, 0);
         actions.rgb.setR((prev) => prev + 100);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(50, 0, 0);
         actions.rgb.setR((prev) => prev - 50);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
 
       test("adjust rgb g", () => {
         let nextColor = colorlib.RGB.new(0, 100, 0);
         actions.rgb.setG((prev) => prev + 100);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(0, 50, 0);
         actions.rgb.setG((prev) => prev - 50);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
 
       test("adjust rgb b", () => {
         let nextColor = colorlib.RGB.new(0, 0, 100);
         actions.rgb.setB((prev) => prev + 100);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
 
         nextColor = colorlib.RGB.new(0, 0, 50);
         actions.rgb.setB((prev) => prev - 50);
-        expectRGB(state.color.rgb, nextColor);
+        expectEqualColor(state.color.rgb, nextColor);
       });
     });
 
@@ -509,31 +476,31 @@ describe("color actions", () => {
       test("adjust hsv h", () => {
         let nextColor = colorlib.HSV.new(100, 0, 0);
         actions.hsv.setH((prev) => prev + 100);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(50, 0, 0);
         actions.hsv.setH((prev) => prev - 50);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
 
       test("adjust hsv s", () => {
         let nextColor = colorlib.HSV.new(0, 1, 0);
         actions.hsv.setS((prev) => prev + 1);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(0, 0.5, 0);
         actions.hsv.setS((prev) => prev - 0.5);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
 
       test("adjust hsv v", () => {
         let nextColor = colorlib.HSV.new(0, 0, 1);
         actions.hsv.setV((prev) => prev + 1);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
 
         nextColor = colorlib.HSV.new(0, 0, 0.5);
         actions.hsv.setV((prev) => prev - 0.5);
-        expectHSV(state.color.hsv, nextColor);
+        expectEqualColor(state.color.hsv, nextColor);
       });
     });
 
@@ -541,31 +508,31 @@ describe("color actions", () => {
       test("adjust hcl h", () => {
         let nextColor = colorlib.HCL.new(100, 0, 0);
         actions.hcl.setH((prev) => prev + 100);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(50, 0, 0);
         actions.hcl.setH((prev) => prev - 50);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
 
       test("adjust hcl c", () => {
         let nextColor = colorlib.HCL.new(0, 1, 0);
         actions.hcl.setC((prev) => prev + 1);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(0, 0.5, 0);
         actions.hcl.setC((prev) => prev - 0.5);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
 
       test("adjust hcl l", () => {
         let nextColor = colorlib.HCL.new(0, 0, 1);
         actions.hcl.setL((prev) => prev + 1);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
 
         nextColor = colorlib.HCL.new(0, 0, 0.5);
         actions.hcl.setL((prev) => prev - 0.5);
-        expectHCL(state.color.hcl, nextColor);
+        expectEqualColor(state.color.hcl, nextColor);
       });
     });
   });

src/hooks/tests/crosshair.test.cy.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 
 import type { CartesianSpace } from "@/types";
 import { valueToPosition } from "@/util";
@@ -12,8 +12,8 @@ function TestSquare() {
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [xValue, setXValue] = useState(0);
   const [yValue, setYValue] = useState(0);
-  const xValueRange = { min: 0, max: 100 };
-  const yValueRange = { min: 0, max: 100 };
+  const xValueRange = useMemo(() => ({ min: 0, max: 100 }), []);
+  const yValueRange = useMemo(() => ({ min: 0, max: 100 }), []);
   const [xPosition, setXPosition] = useState(0);
   const [yPosition, setYPosition] = useState(0);
 
@@ -46,7 +46,7 @@ function TestSquare() {
     const newYPos = valueToPosition(yValue, dimensions.y - 1, yValueRange);
     setXPosition(newXPos);
     setYPosition(newYPos);
-  }, [xValue, yValue]);
+  }, [xValue, yValue, dimensions.x, dimensions.y, xValueRange, yValueRange]);
 
   return (
     <>

src/hooks/tests/dragAndDrop.test.cy.tsx

@@ -1,10 +1,11 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { useState } from "react";
 
 import clsx from "clsx";
 import { motion } from "motion/react";
 
 import { useDragAndDrop } from "../dragAndDrop";
-import styles from "./dragAndDropTest.module.css";
+import styles from "./dragAndDrop.test.module.css";
 
 type Item = {
   id: string;

src/hooks/tests/paletteCard.test.ts

@@ -0,0 +1,417 @@
+import { Hex as HexColor } from "colorlib";
+import { beforeEach, describe, expect, test } from "vitest";
+
+import { mockUseReducer } from "@/testUtil";
+
+import type {
+  PaletteCard,
+  PaletteCardAction,
+  PaletteCardActions,
+  PaletteCardState,
+} from "../paletteCard";
+import { createPaletteCardActions, paletteCardReducer } from "../paletteCard";
+
+// Fixtures
+
+const makeColor = (id: string, hex = "000000") => ({
+  id,
+  name: `Color ${id}`,
+  hex: HexColor.from_code(hex),
+});
+
+const makeCard = (overrides: Partial<PaletteCard> = {}): PaletteCard => ({
+  id: "card_1",
+  name: "Test Palette",
+  colors: [],
+  selectedColorIds: [],
+  ...overrides,
+});
+
+const makeState = (
+  present: PaletteCard,
+  history: PaletteCard[] = [],
+  future: PaletteCard[] = [],
+): PaletteCardState => ({ present, history, future });
+
+const emptyState = makeState(makeCard());
+
+const seededState = makeState(
+  makeCard({
+    colors: [makeColor("a"), makeColor("b"), makeColor("c")],
+  }),
+);
+
+// Helpers
+
+let state: PaletteCardState;
+let dispatch: (value: PaletteCardAction) => void;
+let actions: PaletteCardActions;
+
+const setup = (initial: PaletteCardState) => {
+  [state, dispatch] = mockUseReducer(paletteCardReducer, initial);
+  actions = createPaletteCardActions(dispatch);
+};
+
+// Tests
+
+describe("set card name", () => {
+  beforeEach(() => {
+    setup(emptyState);
+  });
+
+  test("updates name", () => {
+    actions.setCardName("New Name");
+    expect(state.present.name).toBe("New Name");
+  });
+
+  test("pushes to history", () => {
+    actions.setCardName("New Name");
+    expect(state.history.length).toBe(1);
+    expect(state.history[0].name).toBe("Test Palette");
+  });
+
+  test("clears future", () => {
+    const withFuture = makeState(
+      makeCard(),
+      [],
+      [makeCard({ name: "Future" })],
+    );
+    setup(withFuture);
+    actions.setCardName("New Name");
+    expect(state.future.length).toBe(0);
+  });
+});
+
+describe("SET_COLOR_NAME", () => {
+  beforeEach(() => setup(seededState));
+
+  test("updates name of the target color", () => {
+    actions.setColorName("b", "New Name");
+    expect(state.present.colors.find((c) => c.id === "b")?.name).toBe(
+      "New Name",
+    );
+  });
+
+  test("does not affect other colors", () => {
+    actions.setColorName("b", "New Name");
+    expect(state.present.colors.find((c) => c.id === "a")?.name).toMatch(
+      /Color [a-z]/,
+    );
+  });
+
+  test("pushes to history", () => {
+    actions.setColorName("b", "New Name");
+    expect(state.history.length).toBe(1);
+  });
+
+  test("unknown id is a no-op", () => {
+    actions.setColorName("z", "New Name");
+    expect(state.present.colors.map((c) => c.name)).toEqual([
+      "Color a",
+      "Color b",
+      "Color c",
+    ]);
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("SET_COLOR_VALUE", () => {
+  beforeEach(() => setup(seededState));
+
+  test("updates hex of the target color", () => {
+    actions.setColorValue("b", HexColor.from_code("FF0000"));
+    expect(state.present.colors.find((c) => c.id === "b")?.hex.to_code()).toBe(
+      "FF0000",
+    );
+  });
+
+  test("does not affect other colors", () => {
+    actions.setColorValue("b", HexColor.from_code("FF0000"));
+    expect(state.present.colors.find((c) => c.id === "a")?.hex.to_code()).toBe(
+      "000000",
+    );
+  });
+
+  test("pushes to history", () => {
+    actions.setColorValue("b", HexColor.from_code("FF0000"));
+    expect(state.history.length).toBe(1);
+  });
+
+  test("unknown id is a no-op", () => {
+    actions.setColorValue("z", HexColor.from_code("FF0000"));
+    expect(state.present.colors.map((c) => c.hex.to_code())).toEqual([
+      "000000",
+      "000000",
+      "000000",
+    ]);
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("SET_COLOR_VALUE_SILENT", () => {
+  beforeEach(() => setup(seededState));
+
+  test("updates hex of the target color", () => {
+    actions.setColorValueSilent("b", HexColor.from_code("FF0000"));
+    expect(state.present.colors.find((c) => c.id === "b")?.hex.to_code()).toBe(
+      "FF0000",
+    );
+  });
+
+  test("does not affect other colors", () => {
+    actions.setColorValueSilent("b", HexColor.from_code("FF0000"));
+    expect(state.present.colors.find((c) => c.id === "a")?.hex.to_code()).toBe(
+      "000000",
+    );
+  });
+
+  test("does not push to history", () => {
+    actions.setColorValueSilent("b", HexColor.from_code("FF0000"));
+    expect(state.history.length).toBe(0);
+  });
+
+  test("unknown id is a no-op", () => {
+    actions.setColorValueSilent("z", HexColor.from_code("FF0000"));
+    expect(state.present.colors.map((c) => c.hex.to_code())).toEqual([
+      "000000",
+      "000000",
+      "000000",
+    ]);
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("COMMIT_TO_HISTORY", () => {
+  beforeEach(() => setup(seededState));
+
+  test("appends to history without affecting present", () => {
+    const cachedState = makeCard({ id: "cached", name: "Cached Card" });
+    expect(state.history.length).toBe(0);
+    actions.commitToHistory(cachedState);
+    expect(state.history.length).toBe(1);
+    expect(state.present.id).toBe("card_1");
+    expect(state.history[0].id).toBe("cached");
+  });
+});
+
+describe("selection", () => {
+  beforeEach(() => {
+    setup(seededState);
+  });
+
+  test("SET_SELECTED_COLORS replaces selection", () => {
+    actions.setSelectedColors(["a", "b"]);
+    expect(state.present.selectedColorIds).toEqual(["a", "b"]);
+  });
+
+  test("SET_SELECTED_COLORS with empty array clears selection", () => {
+    actions.setSelectedColors(["a"]);
+    actions.setSelectedColors([]);
+    expect(state.present.selectedColorIds).toEqual([]);
+  });
+
+  test("SELECT_ALL selects all color ids", () => {
+    actions.selectAll();
+    expect(state.present.selectedColorIds).toEqual(["a", "b", "c"]);
+  });
+
+  test("SELECT_ALL on empty colors produces empty selection", () => {
+    setup(emptyState);
+    actions.selectAll();
+    expect(state.present.selectedColorIds).toEqual([]);
+  });
+
+  test("CLEAR_SELECTION empties a non-empty selection", () => {
+    actions.setSelectedColors(["a", "b"]);
+    actions.clearSelection();
+    expect(state.present.selectedColorIds).toEqual([]);
+  });
+
+  test("selection actions do not push to history", () => {
+    actions.setSelectedColors(["a"]);
+    actions.selectAll();
+    actions.clearSelection();
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("add colors", () => {
+  test("appends one color", () => {
+    setup(seededState);
+    actions.addColor();
+    expect(state.present.colors.length).toBe(4);
+  });
+
+  test("on empty card produces one color", () => {
+    setup(emptyState);
+    actions.addColor();
+    expect(state.present.colors.length).toBe(1);
+  });
+
+  test("new color has a non-empty id", () => {
+    setup(emptyState);
+    actions.addColor();
+    expect(state.present.colors[0].id).toBeTruthy();
+  });
+
+  test("pushes to history", () => {
+    setup(emptyState);
+    actions.addColor();
+    expect(state.history.length).toBe(1);
+  });
+});
+
+describe("reorder colors", () => {
+  beforeEach(() => setup(seededState));
+
+  test("replaces colors array", () => {
+    const reordered = [makeColor("c"), makeColor("a"), makeColor("b")];
+    actions.reorderColors(reordered);
+    expect(state.present.colors.map((c) => c.id)).toEqual(["c", "a", "b"]);
+  });
+
+  test("pushes to history", () => {
+    actions.reorderColors([makeColor("c"), makeColor("b"), makeColor("a")]);
+    expect(state.history.length).toBe(1);
+  });
+
+  test("does not affect selection", () => {
+    actions.setSelectedColors(["a"]);
+    actions.reorderColors([makeColor("c"), makeColor("b"), makeColor("a")]);
+    expect(state.present.selectedColorIds).toEqual(["a"]);
+  });
+});
+
+describe("delete colors", () => {
+  beforeEach(() => setup(seededState));
+
+  test("removes exactly the selected colors", () => {
+    actions.setSelectedColors(["a", "c"]);
+    actions.deleteSelectedColors();
+    expect(state.present.colors.map((c) => c.id)).toEqual(["b"]);
+  });
+
+  test("clears selection afterward", () => {
+    actions.setSelectedColors(["a"]);
+    actions.deleteSelectedColors();
+    expect(state.present.selectedColorIds).toEqual([]);
+  });
+
+  test("pushes one history entry", () => {
+    actions.setSelectedColors(["a"]);
+    actions.deleteSelectedColors();
+    expect(state.history.length).toBe(1);
+  });
+
+  test("with empty selection is a no-op", () => {
+    actions.deleteSelectedColors();
+    expect(state.present.colors.length).toBe(3);
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("duplicate colors", () => {
+  beforeEach(() => setup(seededState));
+
+  test("appends copies after their originals", () => {
+    actions.setSelectedColors(["b"]);
+    actions.duplicateSelectedColors();
+    const ids = state.present.colors.map((c) => c.id);
+    expect(ids[0]).toBe("a");
+    expect(ids[1]).toBe("b");
+    expect(ids[2]).not.toBe("b"); // new id
+    expect(ids[3]).toBe("c");
+    expect(ids.length).toBe(4);
+  });
+
+  test("duplicate has the same color value", () => {
+    actions.setSelectedColors(["a"]);
+    actions.duplicateSelectedColors();
+    const colors = state.present.colors.map((c) => c.hex);
+    expect(colors[0]).toBe(colors[1]);
+  });
+
+  test("duplicates have new ids", () => {
+    actions.setSelectedColors(["a", "b", "c"]);
+    actions.duplicateSelectedColors();
+    const ids = state.present.colors.map((c) => c.id);
+    const unique = new Set(ids);
+    expect(unique.size).toBe(6);
+  });
+
+  test("maintains selection", () => {
+    actions.setSelectedColors(["a"]);
+    actions.duplicateSelectedColors();
+    expect(state.present.selectedColorIds).toEqual(["a"]);
+  });
+
+  test("pushes one history entry", () => {
+    actions.setSelectedColors(["a"]);
+    actions.duplicateSelectedColors();
+    expect(state.history.length).toBe(1);
+  });
+
+  test("preserves relative order of non-duplicated colors", () => {
+    actions.setSelectedColors(["a"]);
+    actions.duplicateSelectedColors();
+    const ids = state.present.colors.map((c) => c.id);
+    expect(ids.indexOf("b")).toBeLessThan(ids.indexOf("c"));
+  });
+
+  test("with empty selection is a no-op", () => {
+    actions.duplicateSelectedColors();
+    expect(state.present.colors.length).toBe(3);
+    expect(state.history.length).toBe(0);
+  });
+});
+
+describe("undo / redo", () => {
+  beforeEach(() => setup(emptyState));
+
+  test("UNDO restores previous present", () => {
+    actions.setCardName("A");
+    actions.setCardName("B");
+    actions.undo();
+    expect(state.present.name).toBe("A");
+  });
+
+  test("UNDO pushes current present to future", () => {
+    actions.setCardName("A");
+    actions.undo();
+    expect(state.future[0].name).toBe("A");
+  });
+
+  test("UNDO at empty history is a no-op", () => {
+    actions.undo();
+    expect(state.present.name).toBe("Test Palette");
+    expect(state.history.length).toBe(0);
+  });
+
+  test("REDO restores next future", () => {
+    actions.setCardName("A");
+    actions.undo();
+    actions.redo();
+    expect(state.present.name).toBe("A");
+  });
+
+  test("REDO pushes current present to history", () => {
+    actions.setCardName("A");
+    actions.undo();
+    actions.redo();
+    expect(state.history[0].name).toBe("Test Palette");
+  });
+
+  test("REDO at empty future is a no-op", () => {
+    actions.setCardName("A");
+    actions.redo();
+    expect(state.present.name).toBe("A");
+    expect(state.future.length).toBe(0);
+  });
+
+  test("mutation after undo clears future", () => {
+    actions.setCardName("A");
+    actions.undo();
+    actions.setCardName("B");
+    expect(state.future.length).toBe(0);
+  });
+});

src/hooks/tests/slider.test.cy.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 
 import type { CartesianSpace } from "@/types";
 import { Direction } from "@/types";
@@ -17,7 +17,7 @@ function TestSlider({
   const [dimensions, setDimensions] = useState<CartesianSpace>({ x: 0, y: 0 });
   const [value, setValue] = useState(0);
   const [position, setPosition] = useState(0);
-  const valueRange = { min: 0, max: 100 };
+  const valueRange = useMemo(() => ({ min: 0, max: 100 }), []);
   const { sliderRef, isDragging } = useSlider({
     direction,
     origin,
@@ -51,7 +51,7 @@ function TestSlider({
     } else {
       setValue(0);
     }
-  }, [dimensions, direction]);
+  }, [dimensions, direction, position]);
 
   useEffect(() => {
     const maxPosition = chooseValueByDirection(

src/hooks/window.ts

@@ -1,4 +1,4 @@
-export function useResize(callback: () => void): () => void {
+export function onResize(callback: () => void): () => void {
   window.addEventListener("resize", callback);
   return () => window.removeEventListener("resize", callback);
 }

src/providers/MediaQueryProvider.tsx

@@ -1,22 +1,7 @@
-import { createContext, useEffect, useState } from "react";
+import { useEffect, useState } from "react";
 import type { ReactNode } from "react";
 
-enum ViewportMode {
-  DESKTOP = "desktop",
-  MOBILE_LANDSCAPE = "mobile-landscape",
-  MOBILE_PORTRAIT = "mobile-portrait",
-}
-
-interface MediaQueryContextType {
-  viewportMode: ViewportMode;
-  isDesktop: boolean;
-  isMobileLandscape: boolean;
-  isMobilePortrait: boolean;
-}
-
-export const MediaQueryContext = createContext<
-  MediaQueryContextType | undefined
->(undefined);
+import { MediaQueryContext, ViewportMode } from "./context";
 
 export const MediaQueryProvider = ({ children }: { children: ReactNode }) => {
   const [viewportMode, setViewportMode] = useState<ViewportMode>(

src/providers/SelectedColorProvider.tsx

@@ -1,19 +1,11 @@
-import { createContext, useReducer } from "react";
+import { useMemo, useReducer } from "react";
 import type { ReactNode } from "react";
 
 import * as colorlib from "colorlib";
 
 import { colorReducer, createColorActions } from "@/hooks/color";
-import type { ColorActions } from "@/hooks/color";
 
-interface SelectedColorContextType {
-  selectedColor: colorlib.Color;
-  selectedColorActions: ColorActions;
-}
-
-export const SelectedColorContext = createContext<
-  SelectedColorContextType | undefined
->(undefined);
+import { SelectedColorContext } from "./context";
 
 export const SelectedColorProvider = ({
   children,
@@ -24,12 +16,18 @@ export const SelectedColorProvider = ({
     color: colorlib.Color.from_hex("00C9FA"),
   };
   const [colorState, colorDispatch] = useReducer(colorReducer, initialState);
-  const colorActions = createColorActions(colorDispatch);
+  const colorActions = useMemo(
+    () => createColorActions(colorDispatch),
+    [colorDispatch],
+  );
 
-  const value = {
+  const value = useMemo(
+    () => ({
       selectedColor: colorState.color,
       selectedColorActions: colorActions,
-  };
+    }),
+    [colorState.color, colorActions],
+  );
 
   return (
     <SelectedColorContext.Provider value={value}>

src/providers/context.ts

@@ -0,0 +1,31 @@
+import { createContext } from "react";
+
+import * as colorlib from "colorlib";
+
+import type { ColorActions } from "@/hooks/color";
+
+export enum ViewportMode {
+  DESKTOP = "desktop",
+  MOBILE_LANDSCAPE = "mobile-landscape",
+  MOBILE_PORTRAIT = "mobile-portrait",
+}
+
+interface MediaQueryContextType {
+  viewportMode: ViewportMode;
+  isDesktop: boolean;
+  isMobileLandscape: boolean;
+  isMobilePortrait: boolean;
+}
+
+export const MediaQueryContext = createContext<
+  MediaQueryContextType | undefined
+>(undefined);
+
+interface SelectedColorContextType {
+  selectedColor: colorlib.Color;
+  selectedColorActions: ColorActions;
+}
+
+export const SelectedColorContext = createContext<
+  SelectedColorContextType | undefined
+>(undefined);

src/providers/hooks.ts

@@ -1,7 +1,6 @@
 import { useContext } from "react";
 
-import { MediaQueryContext } from "./MediaQueryProvider";
-import { SelectedColorContext } from "./SelectedColorProvider";
+import { MediaQueryContext, SelectedColorContext } from "./context";
 
 export function useMediaQuery() {
   const context = useContext(MediaQueryContext);

src/testUtil.ts

@@ -0,0 +1,46 @@
+import { Color, HCL, HSV, Hex, RGB } from "colorlib";
+import { expect } from "vitest";
+
+export const mockUseReducer = <T extends object, U>(
+  reducer: (state: T, action: U) => T,
+  initialArg: T,
+): [T, (value: U) => void] => {
+  let currentState = initialArg;
+
+  const state = new Proxy({} as T, {
+    get: (_, prop) => currentState[prop as keyof T],
+  });
+
+  const dispatch = (value: U) => {
+    const nextState = reducer(currentState, value);
+    currentState = nextState;
+  };
+  return [state, dispatch];
+};
+
+export const expectEqualColor = <T extends { equals(other: T): boolean }>(
+  value: T,
+  expected: T,
+) => {
+  if (!value.equals(expected)) {
+    if (value instanceof Color && expected instanceof Color) {
+      expect(value.hex.to_code()).toBe(expected.hex.to_code());
+    } else if (value instanceof HCL && expected instanceof HCL) {
+      expect(value.h).toBe(expected.h);
+      expect(value.c).toBe(expected.c);
+      expect(value.l).toBe(expected.l);
+    } else if (value instanceof HSV && expected instanceof HSV) {
+      expect(value.h).toBe(expected.h);
+      expect(value.s).toBe(expected.s);
+      expect(value.v).toBe(expected.v);
+    } else if (
+      (value instanceof RGB && expected instanceof RGB) ||
+      (value instanceof Hex && expected instanceof Hex)
+    ) {
+      expect(value.r).toBe(expected.r);
+      expect(value.g).toBe(expected.g);
+      expect(value.b).toBe(expected.b);
+    }
+  }
+  expect(value.equals(expected)).toBe(true);
+};

src/util.ts

@@ -111,3 +111,11 @@ export function roundTo(
 export function formatCssRgb(hex: Hex) {
   return `rgb(${hex.r},${hex.g},${hex.b})`;
 }
+
+export function formatCssRgbs(hex: Hex, alpha: number) {
+  return `rgb(${hex.r},${hex.g},${hex.b},${roundTo(alpha, 2)})`;
+}
+
+export function randomId(): string {
+  return Math.random().toString(36).slice(2, 8);
+}

vitest.config.ts

@@ -1,9 +1,15 @@
+import * as path from "path";
 import topLevelAwait from "vite-plugin-top-level-await";
 import wasm from "vite-plugin-wasm";
 import { defineConfig } from "vitest/config";
 
 export default defineConfig({
   plugins: [wasm(), topLevelAwait()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
   test: {
     environment: "jsdom",
   },