chore: minor changes

src/app/ui/Layout.svelte

@@ -24,6 +24,8 @@ let { children } = $props();
 
 <svelte:head>
     <link rel="icon" href={favicon} />
+    <link rel="preconnect" href="https://api.fontshare.com" />
+    <link rel="preconnect" href="https://cdn.fontshare.com" crossorigin="anonymous" />
 </svelte:head>
 
 <div id="app-root">

src/entities/Font/index.ts

@@ -60,9 +60,11 @@ export type {
 } from './model';
 
 export {
+    appliedFontsManager,
     createFontshareStore,
     fetchFontshareFontsQuery,
     fontshareStore,
+    selectedFontsStore,
 } from './model';
 
 // Stores
@@ -72,4 +74,8 @@ export {
 } from './model/services/fetchGoogleFonts.svelte';
 
 // UI elements
-export { FontList } from './ui';
+export {
+    FontApplicator,
+    FontListItem,
+    FontVirtualList,
+} from './ui';

src/entities/Font/model/index.ts

@@ -37,7 +37,9 @@ export type {
 export { fetchFontshareFontsQuery } from './services';
 
 export {
+    appliedFontsManager,
     createFontshareStore,
     type FontshareStore,
     fontshareStore,
+    selectedFontsStore,
 } from './store';

src/entities/Font/model/store/appliedFontsStore/appliedFontsStore.svelte.ts

@@ -0,0 +1,143 @@
+import { SvelteMap } from 'svelte/reactivity';
+
+export type FontStatus = 'loading' | 'loaded' | 'error';
+
+class AppliedFontsManager {
+    // Stores: slug -> timestamp of last visibility
+    #usageTracker = new Map<string, number>();
+    // Stores: slug -> batchId
+    #slugToBatch = new Map<string, string>();
+    // Stores: batchId -> HTMLLinkElement (for physical cleanup)
+    #batchElements = new Map<string, HTMLLinkElement>();
+
+    #queue = new Set<string>();
+    #timeoutId: ReturnType<typeof setTimeout> | null = null;
+    #PURGE_INTERVAL = 60000; // Check every minute
+    #TTL = 5 * 60 * 1000; // 5 minutes
+    #CHUNK_SIZE = 3;
+
+    statuses = new SvelteMap<string, FontStatus>();
+
+    constructor() {
+        if (typeof window !== 'undefined') {
+            // Start the "Janitor" loop
+            setInterval(() => this.#purgeUnused(), this.#PURGE_INTERVAL);
+        }
+    }
+
+    /**
+     * Updates the 'last seen' timestamp for fonts.
+     * Prevents them from being purged while they are on screen.
+     */
+    touch(slugs: string[]) {
+        const now = Date.now();
+        const toRegister: string[] = [];
+
+        slugs.forEach(slug => {
+            this.#usageTracker.set(slug, now);
+            if (!this.#slugToBatch.has(slug)) {
+                toRegister.push(slug);
+            }
+        });
+
+        if (toRegister.length > 0) this.registerFonts(toRegister);
+    }
+
+    registerFonts(slugs: string[]) {
+        const newSlugs = slugs.filter(s => !this.#slugToBatch.has(s) && !this.#queue.has(s));
+        if (newSlugs.length === 0) return;
+
+        newSlugs.forEach(s => this.#queue.add(s));
+
+        if (this.#timeoutId) clearTimeout(this.#timeoutId);
+        this.#timeoutId = setTimeout(() => this.#processQueue(), 50);
+    }
+
+    getFontStatus(slug: string) {
+        return this.statuses.get(slug);
+    }
+
+    #processQueue() {
+        const fullQueue = Array.from(this.#queue);
+        if (fullQueue.length === 0) return;
+
+        for (let i = 0; i < fullQueue.length; i += this.#CHUNK_SIZE) {
+            this.#createBatch(fullQueue.slice(i, i + this.#CHUNK_SIZE));
+        }
+
+        this.#queue.clear();
+        this.#timeoutId = null;
+    }
+
+    #createBatch(slugs: string[]) {
+        if (typeof document === 'undefined') return;
+
+        const batchId = crypto.randomUUID();
+        // font-display=swap included for better UX
+        const query = slugs.map(s => `f[]=${s.toLowerCase()}@400`).join('&');
+        const url = `https://api.fontshare.com/v2/css?${query}&display=swap`;
+
+        // Mark all as loading immediately
+        slugs.forEach(slug => this.statuses.set(slug, 'loading'));
+
+        const link = document.createElement('link');
+        link.rel = 'stylesheet';
+        link.href = url;
+        link.dataset.batchId = batchId;
+        document.head.appendChild(link);
+
+        this.#batchElements.set(batchId, link);
+        slugs.forEach(slug => {
+            this.#slugToBatch.set(slug, batchId);
+
+            // Use the Native Font Loading API
+            // format: "font-size font-family"
+            document.fonts.load(`1em "${slug}"`)
+                .then(loadedFonts => {
+                    if (loadedFonts.length > 0) {
+                        this.statuses.set(slug, 'loaded');
+                    } else {
+                        this.statuses.set(slug, 'error');
+                    }
+                })
+                .catch(() => {
+                    this.statuses.set(slug, 'error');
+                });
+        });
+    }
+
+    #purgeUnused() {
+        const now = Date.now();
+        const batchesToPotentialDelete = new Set<string>();
+        const slugsToDelete: string[] = [];
+
+        // Identify expired slugs
+        for (const [slug, lastUsed] of this.#usageTracker.entries()) {
+            if (now - lastUsed > this.#TTL) {
+                const batchId = this.#slugToBatch.get(slug);
+                if (batchId) batchesToPotentialDelete.add(batchId);
+                slugsToDelete.push(slug);
+            }
+        }
+
+        // Only remove a batch if ALL fonts in that batch are expired
+        batchesToPotentialDelete.forEach(batchId => {
+            const batchSlugs = Array.from(this.#slugToBatch.entries())
+                .filter(([_, bId]) => bId === batchId)
+                .map(([slug]) => slug);
+
+            const allExpired = batchSlugs.every(s => slugsToDelete.includes(s));
+
+            if (allExpired) {
+                this.#batchElements.get(batchId)?.remove();
+                this.#batchElements.delete(batchId);
+                batchSlugs.forEach(s => {
+                    this.#slugToBatch.delete(s);
+                    this.#usageTracker.delete(s);
+                });
+            }
+        });
+    }
+}
+
+export const appliedFontsManager = new AppliedFontsManager();

src/entities/Font/model/store/index.ts

@@ -17,3 +17,7 @@ export {
     type FontshareStore,
     fontshareStore,
 } from './fontshareStore.svelte';
+
+export { appliedFontsManager } from './appliedFontsStore/appliedFontsStore.svelte';
+
+export { selectedFontsStore } from './selectedFontsStore/selectedFontsStore.svelte';

src/entities/Font/model/store/selectedFontsStore/selectedFontsStore.svelte.ts

@@ -0,0 +1,4 @@
+import { createEntityStore } from '$shared/lib';
+import type { UnifiedFont } from '../../types';
+
+export const selectedFontsStore = createEntityStore<UnifiedFont>([]);

src/entities/Font/ui/FontApplicator/FontApplicator.svelte

@@ -0,0 +1,46 @@
+<!--
+    Component: FontApplicator
+
+    Loads fonts from fontshare with link tag
+-->
+<script lang="ts">
+import {
+    appliedFontsManager,
+} from '$entities/Font/model/store/appliedFontsStore/appliedFontsStore.svelte';
+import { cn } from '$shared/shadcn/utils/shadcn-utils';
+import type { Snippet } from 'svelte';
+
+interface Props {
+    name: string;
+    id: string;
+    className?: string;
+    children?: Snippet;
+}
+
+let { name, id, className, children }: Props = $props();
+let element: Element;
+
+$effect(() => {
+    const observer = new IntersectionObserver(entries => {
+        if (entries[0].isIntersecting) {
+            appliedFontsManager.touch([id]);
+        }
+    });
+    observer.observe(element);
+    return () => observer.disconnect();
+});
+
+const isLoading = $derived(appliedFontsManager.getFontStatus(id) === 'loading');
+</script>
+
+<div
+    bind:this={element}
+    style:font-family={name}
+    class={cn(
+        'transition-all duration-200 ease-out',
+        isLoading ? 'opacity-0 translate-y-1' : 'opacity-100 translate-y-0',
+        className,
+    )}
+>
+    {@render children?.()}
+</div>

src/entities/Font/ui/FontList/FontList.svelte

@@ -1,32 +0,0 @@
-<!--
-    Component: FontList
-
-    - Displays a virtualized list of fonts with loading, empty, and error states.
-    - Uses unifiedFontStore from context for data, but can accept explicit fonts via props.
--->
-<script lang="ts">
-import FontView from '$features/ShowFont/ui/FontView.svelte';
-import {
-    Content as ItemContent,
-    Root as ItemRoot,
-    Title as ItemTitle,
-} from '$shared/shadcn/ui/item';
-import { VirtualList } from '$shared/ui';
-import { fontshareStore } from '../../model';
-
-$inspect(fontshareStore.fonts);
-</script>
-
-<VirtualList items={fontshareStore.fonts}>
-    {#snippet children({ item: font })}
-        <ItemRoot>
-            <ItemContent>
-                <!-- <ItemTitle></ItemTitle> -->
-                <span class="text-xs text-muted-foreground">
-                    {font.provider} • {font.category}
-                </span>
-                <FontView id={font.id} slug={font.id} name={font.name}>{font.name}</FontView>
-            </ItemContent>
-        </ItemRoot>
-    {/snippet}
-</VirtualList>

src/entities/Font/ui/FontListItem/FontListItem.svelte

@@ -0,0 +1,81 @@
+<!--
+    Component: FontListItem
+    Displays a font item with a checkbox and its characteristics in badges.
+-->
+<script lang="ts">
+import { Badge } from '$shared/shadcn/ui/badge';
+import { Checkbox } from '$shared/shadcn/ui/checkbox';
+import { Label } from '$shared/shadcn/ui/label';
+import {
+    type UnifiedFont,
+    selectedFontsStore,
+} from '../../model';
+import FontApplicator from '../FontApplicator/FontApplicator.svelte';
+
+interface Props {
+    font: UnifiedFont;
+}
+
+const { font }: Props = $props();
+
+const handleChange = (checked: boolean) => {
+    if (checked) {
+        selectedFontsStore.addOne(font);
+    } else {
+        selectedFontsStore.removeOne(font.id);
+    }
+};
+
+const selected = $derived(selectedFontsStore.has(font.id));
+</script>
+
+<div class="pb-1">
+    <Label
+        for={font.id}
+        class="
+            w-full hover:bg-accent/50 flex items-start gap-3 rounded-lg border border-transparent p-3
+            active:scale-[0.98] active:transition-transform active:duration-75
+            has-aria-checked:border-blue-600
+            has-aria-checked:bg-blue-50
+            dark:has-aria-checked:border-blue-900
+            dark:has-aria-checked:bg-blue-950
+        "
+    >
+        <div class="w-full">
+            <div class="flex flex-row gap-1 w-full items-center justify-between">
+                <div class="flex flex-col gap-1 transition-all duration-150 ease-out">
+                    <div class="flex flex-row gap-1">
+                        <Badge variant="outline" class="text-[0.5rem]">
+                            {font.provider}
+                        </Badge>
+                        <Badge variant="outline" class="text-[0.5rem]">
+                            {font.category}
+                        </Badge>
+                    </div>
+                    <FontApplicator
+                        id={font.id}
+                        className="text-2xl"
+                        name={font.name}
+                    >
+                        {font.name}
+                    </FontApplicator>
+                </div>
+
+                <Checkbox
+                    id={font.id}
+                    checked={selected}
+                    onCheckedChange={handleChange}
+                    class="
+                        transition-all duration-150 ease-out
+                        data-[state=checked]:scale-100
+                        data-[state=checked]:border-blue-600
+                        data-[state=checked]:bg-blue-600
+                        data-[state=checked]:text-white
+                        dark:data-[state=checked]:border-blue-700
+                        dark:data-[state=checked]:bg-blue-700
+                    "
+                />
+            </div>
+        </div>
+    </Label>
+</div>

src/entities/Font/ui/FontVirtualList/FontVirtualList.svelte

@@ -0,0 +1,30 @@
+<script lang="ts" generics="T extends { id: string }">
+import { VirtualList } from '$shared/ui';
+import type { ComponentProps } from 'svelte';
+import { appliedFontsManager } from '../../model/store/appliedFontsStore/appliedFontsStore.svelte';
+
+interface Props extends Omit<ComponentProps<typeof VirtualList<T>>, 'onVisibleItemsChange'> {
+    onVisibleItemsChange?: (items: T[]) => void;
+}
+
+let { items, children, onVisibleItemsChange, ...rest }: Props = $props();
+
+function handleInternalVisibleChange(visibleItems: T[]) {
+    // Auto-register fonts with the manager
+    const slugs = visibleItems.map(item => item.id);
+    appliedFontsManager.registerFonts(slugs);
+
+    // Forward the call to any external listener
+    onVisibleItemsChange?.(visibleItems);
+}
+</script>
+
+<VirtualList
+    {items}
+    {...rest}
+    onVisibleItemsChange={handleInternalVisibleChange}
+>
+    {#snippet children(scope)}
+        {@render children(scope)}
+    {/snippet}
+</VirtualList>

src/entities/Font/ui/index.ts

@@ -1,3 +1,9 @@
-import FontList from './FontList/FontList.svelte';
+import FontApplicator from './FontApplicator/FontApplicator.svelte';
+import FontListItem from './FontListItem/FontListItem.svelte';
+import FontVirtualList from './FontVirtualList/FontVirtualList.svelte';
 
-export { FontList };
+export {
+    FontApplicator,
+    FontListItem,
+    FontVirtualList,
+};

src/features/DisplayFont/model/index.ts

@@ -0,0 +1 @@
+export { displayedFontsStore } from './store';

src/features/DisplayFont/model/store/displayedFontsStore.svelte.ts

@@ -0,0 +1,23 @@
+import { selectedFontsStore } from '$entities/Font';
+
+export class DisplayedFontsStore {
+    #sampleText = $state('The quick brown fox jumps over the lazy dog');
+
+    #displayedFonts = $derived.by(() => {
+        return selectedFontsStore.all;
+    });
+
+    get fonts() {
+        return this.#displayedFonts;
+    }
+
+    get text() {
+        return this.#sampleText;
+    }
+
+    set text(text: string) {
+        this.#sampleText = text;
+    }
+}
+
+export const displayedFontsStore = new DisplayedFontsStore();

src/features/DisplayFont/model/store/index.ts

@@ -0,0 +1 @@
+export { displayedFontsStore } from './displayedFontsStore.svelte';

src/features/DisplayFont/ui/FontDisplay/FontDisplay.svelte

@@ -0,0 +1,14 @@
+<!--
+    Component: FontDisplay
+    Displays a grid of FontSampler components for each displayed font.
+-->
+<script>
+import { displayedFontsStore } from '../../model';
+import FontSampler from '../FontSampler/FontSampler.svelte';
+</script>
+
+<div class="grid gap-2 grid-cols-[repeat(auto-fit,minmax(500px,1fr))]">
+    {#each displayedFontsStore.fonts as font (font.id)}
+        <FontSampler font={font} bind:text={displayedFontsStore.text} />
+    {/each}
+</div>

src/features/DisplayFont/ui/FontSampler/FontSampler.svelte

@@ -0,0 +1,37 @@
+<!--
+    Component: FontSampler
+    Displays a sample text with a given font in a contenteditable element.
+-->
+<script lang="ts">
+import {
+    FontApplicator,
+    type UnifiedFont,
+} from '$entities/Font';
+import { ContentEditable } from '$shared/ui';
+
+interface Props {
+    font: UnifiedFont;
+    text: string;
+    fontSize?: number;
+    lineHeight?: number;
+    letterSpacing?: number;
+}
+
+let {
+    font,
+    text = $bindable(),
+    ...restProps
+}: Props = $props();
+</script>
+
+<div
+    class="
+        w-full rounded-xl
+        bg-white p-6 border border-slate-200
+        shadow-sm dark:border-slate-800 dark:bg-slate-950
+    "
+>
+    <FontApplicator id={font.id} name={font.name}>
+        <ContentEditable bind:text={text} {...restProps} />
+    </FontApplicator>
+</div>

src/features/GetFonts/ui/FontSearch/FontSearch.svelte

@@ -4,14 +4,12 @@
     Combines search input with font list display
 -->
 <script lang="ts">
-import {
-    FontList,
-    fontshareStore,
-} from '$entities/Font';
+import { fontshareStore } from '$entities/Font';
 import { SearchBar } from '$shared/ui';
 import { onMount } from 'svelte';
 import { mapManagerToParams } from '../../lib';
 import { filterManager } from '../../model';
+import SuggestedFonts from '../SuggestedFonts/SuggestedFonts.svelte';
 
 onMount(() => {
     /**
@@ -31,5 +29,5 @@ onMount(() => {
     placeholder="Search fonts by name..."
     bind:value={filterManager.queryValue}
 >
-    <FontList />
+    <SuggestedFonts />
 </SearchBar>

src/features/GetFonts/ui/SuggestedFonts/SuggestedFonts.svelte

@@ -0,0 +1,13 @@
+<script lang="ts">
+import {
+    FontListItem,
+    FontVirtualList,
+    fontshareStore,
+} from '$entities/Font';
+</script>
+
+<FontVirtualList items={fontshareStore.fonts}>
+    {#snippet children({ item: font })}
+        <FontListItem {font} />
+    {/snippet}
+</FontVirtualList>

src/features/ShowFont/ui/FontView.svelte

@@ -1,40 +0,0 @@
-<!--
-    Component: FontView
-
-    Loads fonts from fontshare with link tag
--->
-<script lang="ts">
-interface Props {
-    name: string;
-    slug: string;
-    id: string;
-    children?: import('svelte').Snippet;
-}
-
-let { name, slug, id, children }: Props = $props();
-let isLoaded = $state(false);
-
-// Construct the Fontshare API CSS URL
-// We specify the weight (400) or 'all'
-const cssUrl = $derived(`https://api.fontshare.com/v2/css?f[]=${id}&display=swap`);
-
-$effect(() => {
-    // Even though we use a link tag, we can still "watch"
-    // for the font to be ready for a smooth fade-in
-    document.fonts.load(`1em "${name}"`).then(() => {
-        isLoaded = true;
-    });
-});
-</script>
-
-<svelte:head>
-    <link rel="stylesheet" href={cssUrl} />
-</svelte:head>
-
-<div
-    style:--f={name}
-    style:font-family={name ? `'${name}', sans-serif` : 'inherit'}
-    class="transition-opacity duration-500 {isLoaded ? 'font-[var(--f)] opacity-100' : 'font-sans opacity-0'}"
->
-    {@render children?.()}
-</div>

src/routes/Page.svelte

@@ -1,8 +1,12 @@
 <script lang="ts">
+import FontDisplay from '$features/DisplayFont/ui/FontDisplay/FontDisplay.svelte';
+
 /**
  * Page Component
  */
 </script>
 
 <!-- Font List -->
-<div />
+<div class="p-2">
+    <FontDisplay />
+</div>

src/shared/lib/accessibility/motion.svelte.ts

@@ -4,11 +4,6 @@ const isBrowser = typeof window !== 'undefined';
 class MotionPreference {
     // Reactive state
     #reduced = $state(false);
-    #mediaQuery: MediaQueryList = new MediaQueryList();
-
-    private handleChange = (e: MediaQueryListEvent) => {
-        this.#reduced = e.matches;
-    };
 
     constructor() {
         if (isBrowser) {
@@ -17,9 +12,12 @@ class MotionPreference {
             // Set initial value immediately
             this.#reduced = mediaQuery.matches;
 
-            mediaQuery.addEventListener('change', this.handleChange);
+            // Simple listener that updates the reactive state
+            const handleChange = (e: MediaQueryListEvent) => {
+                this.#reduced = e.matches;
+            };
 
-            this.#mediaQuery = mediaQuery;
+            mediaQuery.addEventListener('change', handleChange);
         }
     }
 
@@ -27,10 +25,6 @@ class MotionPreference {
     get reduced() {
         return this.#reduced;
     }
-
-    destroy() {
-        this.#mediaQuery.removeEventListener('change', this.handleChange);
-    }
 }
 
 // Export a single instance to be used everywhere

src/shared/lib/helpers/createEntityStore/createEntityStore.svelte.ts

@@ -0,0 +1,80 @@
+import { SvelteMap } from 'svelte/reactivity';
+
+export interface Entity {
+    id: string;
+}
+
+/**
+ * Svelte 5 Entity Store
+ * Uses SvelteMap for O(1) lookups and granular reactivity.
+ */
+export class EntityStore<T extends Entity> {
+    // SvelteMap is a reactive version of the native Map
+    #entities = new SvelteMap<string, T>();
+
+    constructor(initialEntities: T[] = []) {
+        this.setAll(initialEntities);
+    }
+
+    // --- Selectors (Equivalent to Selectors) ---
+
+    /** Get all entities as an array */
+    get all() {
+        return Array.from(this.#entities.values());
+    }
+
+    /** Select a single entity by ID */
+    getById(id: string) {
+        return this.#entities.get(id);
+    }
+
+    /** Select multiple entities by IDs */
+    getByIds(ids: string[]) {
+        return ids.map(id => this.#entities.get(id)).filter((e): e is T => !!e);
+    }
+
+    // --- Actions (CRUD) ---
+
+    addOne(entity: T) {
+        this.#entities.set(entity.id, entity);
+    }
+
+    addMany(entities: T[]) {
+        entities.forEach(e => this.addOne(e));
+    }
+
+    updateOne(id: string, changes: Partial<T>) {
+        const entity = this.#entities.get(id);
+        if (entity) {
+            // In Svelte 5, updating the object property directly is reactive
+            // if the object itself was made reactive, but here we replace
+            // the reference to ensure top-level map triggers.
+            this.#entities.set(id, { ...entity, ...changes });
+        }
+    }
+
+    removeOne(id: string) {
+        this.#entities.delete(id);
+    }
+
+    removeMany(ids: string[]) {
+        ids.forEach(id => this.#entities.delete(id));
+    }
+
+    setAll(entities: T[]) {
+        this.#entities.clear();
+        this.addMany(entities);
+    }
+
+    has(id: string) {
+        return this.#entities.has(id);
+    }
+
+    clear() {
+        this.#entities.clear();
+    }
+}
+
+export function createEntityStore<T extends Entity>(initialEntities: T[] = []) {
+    return new EntityStore<T>(initialEntities);
+}

src/shared/lib/helpers/createVirtualizer/createVirtualizer.svelte.ts

@@ -79,7 +79,11 @@ export interface VirtualizerOptions {
  * </div>
  * ```
  */
-export function createVirtualizer<T>(optionsGetter: () => VirtualizerOptions & { data: T[] }) {
+export function createVirtualizer<T>(
+    optionsGetter: () => VirtualizerOptions & {
+        data: T[];
+    },
+) {
     let scrollOffset = $state(0);
     let containerHeight = $state(0);
     let measuredSizes = $state<Record<number, number>>({});
@@ -149,6 +153,7 @@ export function createVirtualizer<T>(optionsGetter: () => VirtualizerOptions & {
                 key: options.getItemKey?.(i) ?? i,
             });
         }
+
         return result;
     });
     // Svelte Actions (The DOM Interface)

src/shared/lib/helpers/index.ts

@@ -20,3 +20,9 @@ export {
 } from './createVirtualizer/createVirtualizer.svelte';
 
 export { createDebouncedState } from './createDebouncedState/createDebouncedState.svelte';
+
+export {
+    createEntityStore,
+    type Entity,
+    type EntityStore,
+} from './createEntityStore/createEntityStore.svelte';

src/shared/lib/index.ts

@@ -2,9 +2,12 @@ export {
     type ControlDataModel,
     type ControlModel,
     createDebouncedState,
+    createEntityStore,
     createFilter,
     createTypographyControl,
     createVirtualizer,
+    type Entity,
+    type EntityStore,
     type Filter,
     type FilterModel,
     type Property,
@@ -15,3 +18,4 @@ export {
 } from './helpers';
 
 export { motion } from './accessibility/motion.svelte';
+export { splitArray } from './utils';

src/shared/lib/utils/index.ts

@@ -11,3 +11,4 @@ export { clampNumber } from './clampNumber/clampNumber';
 export { debounce } from './debounce/debounce';
 export { getDecimalPlaces } from './getDecimalPlaces/getDecimalPlaces';
 export { roundToStepPrecision } from './roundToStepPrecision/roundToStepPrecision';
+export { splitArray } from './splitArray/splitArray';

src/shared/lib/utils/splitArray/splitArray.ts

@@ -0,0 +1,8 @@
+export function splitArray<T>(array: T[], callback: (item: T) => boolean) {
+    return array.reduce<[T[], T[]]>(
+        ([pass, fail], item) => (
+            callback(item) ? pass.push(item) : fail.push(item), [pass, fail]
+        ),
+        [[], []],
+    );
+}

src/shared/ui/ContentEditable/ContentEditable.svelte

@@ -0,0 +1,62 @@
+<!--
+    Component: ContentEditable
+    Provides a contenteditable div with custom font and text properties.
+-->
+<script lang="ts">
+interface Props {
+    /**
+     * Visible text
+     */
+    text: string;
+    /**
+     * Font settings
+     */
+    fontSize?: number;
+    lineHeight?: number;
+    letterSpacing?: number;
+}
+
+let {
+    text = $bindable('The quick brown fox jumps over the lazy dog.'),
+    fontSize = 48,
+    lineHeight = 1.2,
+    letterSpacing = 0,
+}: Props = $props();
+
+let element: HTMLDivElement | undefined = $state();
+
+// Initial Sync: Set the text ONLY ONCE when the element is created.
+// This prevents Svelte from "owning" the innerHTML/innerText.
+$effect(() => {
+    if (element && element.innerText !== text) {
+        element.innerText = text;
+    }
+});
+
+// Handle changes: Update the outer state without re-rendering the div.
+function handleInput(e: Event) {
+    const target = e.target as HTMLDivElement;
+    // Update the bindable prop directly
+    text = target.innerText;
+}
+</script>
+
+<div
+    bind:this={element}
+    contenteditable="plaintext-only"
+    spellcheck="false"
+    role="textbox"
+    tabindex="0"
+    data-placeholder="Type something to test..."
+    oninput={handleInput}
+    class="
+        w-full min-h-[1.2em] outline-none transition-all duration-200
+        empty:before:content-[attr(data-placeholder)] empty:before:text-slate-400
+        selection:bg-indigo-100 selection:text-indigo-900
+        caret-indigo-500
+    "
+    style:font-size="{fontSize}px"
+    style:line-height={lineHeight}
+    style:letter-spacing="{letterSpacing}em"
+>
+</div>

src/shared/ui/VirtualList/VirtualList.svelte

@@ -35,6 +35,11 @@ interface Props {
      * (follows shadcn convention for className prop)
      */
     class?: string;
+    /**
+     * An optional callback that will be called for each new set of loaded items
+     * @param items - Loaded items
+     */
+    onVisibleItemsChange?: (items: T[]) => void;
     /**
      * Snippet for rendering individual list items.
      *
@@ -50,7 +55,8 @@ interface Props {
     children: Snippet<[{ item: T; index: number }]>;
 }
 
-let { items, itemHeight = 80, overscan = 5, class: className, children }: Props = $props();
+let { items, itemHeight = 80, overscan = 5, class: className, onVisibleItemsChange, children }:
+    Props = $props();
 
 const virtualizer = createVirtualizer(() => ({
     count: items.length,
@@ -58,12 +64,17 @@ const virtualizer = createVirtualizer(() => ({
     estimateSize: typeof itemHeight === 'function' ? itemHeight : () => itemHeight,
     overscan,
 }));
+
+$effect(() => {
+    const visibleItems = virtualizer.items.map(item => items[item.index]);
+    onVisibleItemsChange?.(visibleItems);
+});
 </script>
 
 <div
     use:virtualizer.container
     class={cn(
-        'relative overflow-auto border rounded-md bg-background',
+        'relative overflow-auto rounded-md bg-background',
         'h-150 w-full',
         className,
     )}

src/shared/ui/index.ts

@@ -6,12 +6,14 @@
 
 import CheckboxFilter from './CheckboxFilter/CheckboxFilter.svelte';
 import ComboControl from './ComboControl/ComboControl.svelte';
+import ContentEditable from './ContentEditable/ContentEditable.svelte';
 import SearchBar from './SearchBar/SearchBar.svelte';
 import VirtualList from './VirtualList/VirtualList.svelte';
 
 export {
     CheckboxFilter,
     ComboControl,
+    ContentEditable,
     SearchBar,
     VirtualList,
 };