chore: move ControlId type to the entities/Font layer

src/app/ui/Layout.svelte

@@ -85,19 +85,11 @@ onDestroy(() => themeManager.destroy());
             theme === 'dark' ? 'dark' : '',
         )}
     >
-        <header>
-            <BreadcrumbHeader />
-        </header>
-
-        <!-- <ScrollArea class="h-screen w-screen"> -->
-        <!-- <main class="flex-1 w-full mx-auto relative"> -->
         <TooltipProvider>
             {#if fontsReady}
                 {@render children?.()}
             {/if}
         </TooltipProvider>
-        <!-- </main> -->
-        <!-- </ScrollArea> -->
         <footer></footer>
     </div>
 </ResponsiveProvider>

src/entities/Font/model/const/const.ts

@@ -1,5 +1,5 @@
 import type { ControlModel } from '$shared/lib';
-import type { ControlId } from '..';
+import type { ControlId } from '../types/typography';
 
 /**
  * Font size constants

src/entities/Font/model/index.ts

@@ -1,2 +1,3 @@
+export * from './const/const';
 export * from './store';
 export * from './types';

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

@@ -1,5 +1,5 @@
 // Applied fonts manager
-export { appliedFontsManager } from './appliedFontsStore/appliedFontsStore.svelte';
+export * from './appliedFontsStore/appliedFontsStore.svelte';
 
 // Batch font store
 export { BatchFontStore } from './batchFontStore.svelte';

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

@@ -33,3 +33,4 @@ export type {
 } from './store';
 
 export * from './store/appliedFonts';
+export * from './typography';

src/entities/Font/model/types/typography.ts

@@ -0,0 +1 @@
+export type ControlId = 'font_size' | 'font_weight' | 'line_height' | 'letter_spacing';

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

@@ -10,6 +10,7 @@ import { cn } from '$shared/shadcn/utils/shadcn-utils';
 import type { Snippet } from 'svelte';
 import { prefersReducedMotion } from 'svelte/motion';
 import {
+    DEFAULT_FONT_WEIGHT,
     type UnifiedFont,
     appliedFontsManager,
 } from '../../model';
@@ -36,7 +37,7 @@ interface Props {
 
 let {
     font,
-    weight = 400,
+    weight = DEFAULT_FONT_WEIGHT,
     className,
     children,
 }: Props = $props();

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

@@ -18,8 +18,8 @@ import {
     type FontLoadRequestConfig,
     type UnifiedFont,
     appliedFontsManager,
+    fontStore,
 } from '../../model';
-import { fontStore } from '../../model/store';
 
 interface Props extends
     Omit<
@@ -53,30 +53,42 @@ const isLoading = $derived(
     fontStore.isFetching || fontStore.isLoading,
 );
 
-function handleInternalVisibleChange(visibleItems: UnifiedFont[]) {
-    const configs: FontLoadRequestConfig[] = [];
-
-    visibleItems.forEach(item => {
-        const url = getFontUrl(item, weight);
-
-        if (url) {
-            configs.push({
-                id: item.id,
-                name: item.name,
-                weight,
-                url,
-                isVariable: item.features?.isVariable,
-            });
-        }
-    });
-
-    // Auto-register fonts with the manager
-    appliedFontsManager.touch(configs);
+let visibleFonts = $state<UnifiedFont[]>([]);
 
+function handleInternalVisibleChange(items: UnifiedFont[]) {
+    visibleFonts = items;
     // Forward the call to any external listener
-    // onVisibleItemsChange?.(visibleItems);
+    onVisibleItemsChange?.(items);
 }
 
+// Re-touch whenever visible set or weight changes — fixes weight-change gap
+$effect(() => {
+    const configs: FontLoadRequestConfig[] = visibleFonts.flatMap(item => {
+        const url = getFontUrl(item, weight);
+        if (!url) return [];
+        return [{ id: item.id, name: item.name, weight, url, isVariable: item.features?.isVariable }];
+    });
+    if (configs.length > 0) {
+        appliedFontsManager.touch(configs);
+    }
+});
+
+// Pin visible fonts so the eviction policy never removes on-screen entries.
+// Cleanup captures the snapshot values, so a weight change unpins the old
+// weight before pinning the new one.
+$effect(() => {
+    const w = weight;
+    const fonts = visibleFonts;
+    for (const f of fonts) {
+        appliedFontsManager.pin(f.id, w, f.features?.isVariable);
+    }
+    return () => {
+        for (const f of fonts) {
+            appliedFontsManager.unpin(f.id, w, f.features?.isVariable);
+        }
+    };
+});
+
 /**
  * Load more fonts by moving to the next page
  */

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

@@ -35,7 +35,6 @@ const { Story } = defineMeta({
 
 <script lang="ts">
 import type { UnifiedFont } from '$entities/Font';
-import { controlManager } from '$features/SetupFont';
 
 // Mock fonts for testing
 const mockArial: UnifiedFont = {

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

@@ -8,14 +8,13 @@ import {
     FontApplicator,
     type UnifiedFont,
 } from '$entities/Font';
-import { controlManager } from '$features/SetupFont';
+import { typographySettingsStore } from '$features/SetupFont/model';
 import {
     Badge,
     ContentEditable,
     Divider,
     Footnote,
     Stat,
-    StatGroup,
 } from '$shared/ui';
 import { fly } from 'svelte/transition';
 
@@ -37,11 +36,6 @@ interface Props {
 
 let { font, text = $bindable(), index = 0 }: Props = $props();
 
-const fontWeight = $derived(controlManager.weight);
-const fontSize = $derived(controlManager.renderedSize);
-const lineHeight = $derived(controlManager.height);
-const letterSpacing = $derived(controlManager.spacing);
-
 // Adjust the property name to match your UnifiedFont type
 const fontType = $derived((font as any).type ?? (font as any).category ?? '');
 
@@ -52,10 +46,10 @@ const providerBadge = $derived(
 );
 
 const stats = $derived([
-    { label: 'SZ', value: `${fontSize}PX` },
-    { label: 'WGT', value: `${fontWeight}` },
-    { label: 'LH', value: lineHeight?.toFixed(2) },
-    { label: 'LTR', value: `${letterSpacing}` },
+    { label: 'SZ', value: `${typographySettingsStore.renderedSize}PX` },
+    { label: 'WGT', value: `${typographySettingsStore.weight}` },
+    { label: 'LH', value: typographySettingsStore.height?.toFixed(2) },
+    { label: 'LTR', value: `${typographySettingsStore.spacing}` },
 ]);
 </script>
 
@@ -75,7 +69,7 @@ const stats = $derived([
         min-h-60
         rounded-none
     "
-    style:font-weight={fontWeight}
+    style:font-weight={typographySettingsStore.weight}
 >
     <!-- ── Header bar ─────────────────────────────────────────────────── -->
     <div
@@ -140,12 +134,12 @@ const stats = $derived([
 
     <!-- ── Main content area ──────────────────────────────────────────── -->
     <div class="flex-1 p-4 sm:p-5 md:p-8 flex items-center overflow-hidden bg-paper dark:bg-dark-card relative z-10">
-        <FontApplicator {font} weight={fontWeight}>
+        <FontApplicator {font} weight={typographySettingsStore.weight}>
             <ContentEditable
                 bind:text
-                {fontSize}
-                {lineHeight}
-                {letterSpacing}
+                fontSize={typographySettingsStore.renderedSize}
+                lineHeight={typographySettingsStore.height}
+                letterSpacing={typographySettingsStore.spacing}
             />
         </FontApplicator>
     </div>

src/features/SetupFont/index.ts

@@ -1,28 +1,6 @@
-export { TypographyMenu } from './ui';
-
 export {
-    type ControlId,
-    controlManager,
-    DEFAULT_FONT_SIZE,
-    DEFAULT_FONT_WEIGHT,
-    DEFAULT_LETTER_SPACING,
-    DEFAULT_LINE_HEIGHT,
-    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
-    FONT_SIZE_STEP,
-    FONT_WEIGHT_STEP,
-    LINE_HEIGHT_STEP,
-    MAX_FONT_SIZE,
-    MAX_FONT_WEIGHT,
-    MAX_LINE_HEIGHT,
-    MIN_FONT_SIZE,
-    MIN_FONT_WEIGHT,
-    MIN_LINE_HEIGHT,
-    MULTIPLIER_L,
-    MULTIPLIER_M,
-    MULTIPLIER_S,
-} from './model';
-
-export {
-    createTypographyControlManager,
-    type TypographyControlManager,
+    createTypographySettingsManager,
+    type TypographySettingsManager,
 } from './lib';
+export { typographySettingsStore } from './model';
+export { TypographyMenu } from './ui';

src/features/SetupFont/lib/index.ts

@@ -1,4 +1,4 @@
 export {
-    createTypographyControlManager,
-    type TypographyControlManager,
-} from './controlManager/controlManager.svelte';
+    createTypographySettingsManager,
+    type TypographySettingsManager,
+} from './settingsManager/settingsManager.svelte';

src/features/SetupFont/lib/settingsManager/settingsManager.svelte.ts

@@ -10,6 +10,13 @@
  * when displaying/editing, but the base size is what's stored.
  */
 
+import {
+    type ControlId,
+    DEFAULT_FONT_SIZE,
+    DEFAULT_FONT_WEIGHT,
+    DEFAULT_LETTER_SPACING,
+    DEFAULT_LINE_HEIGHT,
+} from '$entities/Font';
 import {
     type ControlDataModel,
     type ControlModel,
@@ -19,13 +26,6 @@ import {
     createTypographyControl,
 } from '$shared/lib';
 import { SvelteMap } from 'svelte/reactivity';
-import {
-    type ControlId,
-    DEFAULT_FONT_SIZE,
-    DEFAULT_FONT_WEIGHT,
-    DEFAULT_LETTER_SPACING,
-    DEFAULT_LINE_HEIGHT,
-} from '../../model';
 
 type ControlOnlyFields<T extends string = string> = Omit<ControlModel<T>, keyof ControlDataModel>;
 
@@ -52,7 +52,7 @@ export interface TypographySettings {
  * Manages multiple typography controls with persistent storage and
  * responsive scaling support for font size.
  */
-export class TypographyControlManager {
+export class TypographySettingsManager {
     /** Map of controls keyed by ID */
     #controls = new SvelteMap<string, Control>();
     /** Responsive multiplier for font size display */
@@ -242,7 +242,7 @@ export class TypographyControlManager {
  * @param storageId - Persistent storage identifier
  * @returns Typography control manager instance
  */
-export function createTypographyControlManager(
+export function createTypographySettingsManager(
     configs: ControlModel<ControlId>[],
     storageId: string = 'glyphdiff:typography',
 ) {
@@ -252,5 +252,5 @@ export function createTypographyControlManager(
         lineHeight: DEFAULT_LINE_HEIGHT,
         letterSpacing: DEFAULT_LETTER_SPACING,
     });
-    return new TypographyControlManager(configs, storage);
+    return new TypographySettingsManager(configs, storage);
 }

src/features/SetupFont/lib/settingsManager/settingsManager.test.ts

@@ -1,4 +1,11 @@
 /** @vitest-environment jsdom */
+import {
+    DEFAULT_FONT_SIZE,
+    DEFAULT_FONT_WEIGHT,
+    DEFAULT_LETTER_SPACING,
+    DEFAULT_LINE_HEIGHT,
+    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
+} from '$entities/Font';
 import {
     afterEach,
     beforeEach,
@@ -8,21 +15,14 @@ import {
     vi,
 } from 'vitest';
 import {
-    DEFAULT_FONT_SIZE,
-    DEFAULT_FONT_WEIGHT,
-    DEFAULT_LETTER_SPACING,
-    DEFAULT_LINE_HEIGHT,
-    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
-} from '../../model';
-import {
-    TypographyControlManager,
     type TypographySettings,
-} from './controlManager.svelte';
+    TypographySettingsManager,
+} from './settingsManager.svelte';
 
 /**
- * Test Strategy for TypographyControlManager
+ * Test Strategy for TypographySettingsManager
  *
- * This test suite validates the TypographyControlManager state management logic.
+ * This test suite validates the TypographySettingsManager state management logic.
  * These are unit tests for the manager logic, separate from component rendering.
  *
  * NOTE: Svelte 5's $effect runs in microtasks, so we need to flush effects
@@ -45,7 +45,7 @@ async function flushEffects() {
     await Promise.resolve();
 }
 
-describe('TypographyControlManager - Unit Tests', () => {
+describe('TypographySettingsManager - Unit Tests', () => {
     let mockStorage: TypographySettings;
     let mockPersistentStore: {
         value: TypographySettings;
@@ -85,7 +85,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Initialization', () => {
         it('creates manager with default values from storage', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -105,7 +105,7 @@ describe('TypographyControlManager - Unit Tests', () => {
             };
             mockPersistentStore = createMockPersistentStore(mockStorage);
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -117,7 +117,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('initializes font size control with base size multiplied by current multiplier (1)', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -126,7 +126,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('returns all controls via controls getter', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -142,7 +142,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('returns individual controls via specific getters', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -160,7 +160,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('control instances have expected interface', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -179,7 +179,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Multiplier System', () => {
         it('has default multiplier of 1', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -188,7 +188,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates multiplier when set', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -201,7 +201,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('does not update multiplier if set to same value', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -217,7 +217,7 @@ describe('TypographyControlManager - Unit Tests', () => {
             mockStorage = { fontSize: 48, fontWeight: 400, lineHeight: 1.5, letterSpacing: 0 };
             mockPersistentStore = createMockPersistentStore(mockStorage);
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -241,7 +241,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates font size control display value when multiplier increases', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -262,7 +262,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Base Size Setter', () => {
         it('updates baseSize when set directly', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -273,7 +273,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates size control value when baseSize is set', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -284,7 +284,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('applies multiplier to size control when baseSize is set', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -298,7 +298,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Rendered Size Calculation', () => {
         it('calculates renderedSize as baseSize * multiplier', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -307,7 +307,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates renderedSize when multiplier changes', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -320,7 +320,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates renderedSize when baseSize changes', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -340,7 +340,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         // proxy effect behavior should be tested in E2E tests.
 
         it('does NOT immediately update baseSize from control change (effect is async)', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -355,7 +355,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('updates baseSize via direct setter (synchronous)', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -380,7 +380,7 @@ describe('TypographyControlManager - Unit Tests', () => {
             };
             mockPersistentStore = createMockPersistentStore(mockStorage);
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -393,7 +393,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('syncs to storage after effect flush (async)', async () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -409,7 +409,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('syncs control changes to storage after effect flush (async)', async () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -422,7 +422,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('syncs height control changes to storage after effect flush (async)', async () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -434,7 +434,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('syncs spacing control changes to storage after effect flush (async)', async () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -448,7 +448,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Control Value Getters', () => {
         it('returns current weight value', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -460,7 +460,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('returns current height value', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -472,7 +472,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('returns current spacing value', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -485,7 +485,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
         it('returns default value when control is not found', () => {
             // Create a manager with empty configs (no controls)
-            const manager = new TypographyControlManager([], mockPersistentStore);
+            const manager = new TypographySettingsManager([], mockPersistentStore);
 
             expect(manager.weight).toBe(DEFAULT_FONT_WEIGHT);
             expect(manager.height).toBe(DEFAULT_LINE_HEIGHT);
@@ -503,7 +503,7 @@ describe('TypographyControlManager - Unit Tests', () => {
             };
             mockPersistentStore = createMockPersistentStore(mockStorage);
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -536,7 +536,7 @@ describe('TypographyControlManager - Unit Tests', () => {
                 clear: clearSpy,
             };
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -547,7 +547,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('respects multiplier when resetting font size control', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -565,7 +565,7 @@ describe('TypographyControlManager - Unit Tests', () => {
 
     describe('Complex Scenarios', () => {
         it('handles changing multiplier then modifying baseSize', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -586,7 +586,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('maintains correct renderedSize throughout changes', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -608,7 +608,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles multiple control changes in sequence', async () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -633,7 +633,7 @@ describe('TypographyControlManager - Unit Tests', () => {
             mockStorage = { fontSize: 48, fontWeight: 400, lineHeight: 1.5, letterSpacing: 0 };
             mockPersistentStore = createMockPersistentStore(mockStorage);
 
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -645,7 +645,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles very small multiplier', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -658,7 +658,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles large base size with multiplier', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -671,7 +671,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles floating point precision in multiplier', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -690,7 +690,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles control methods (increase/decrease)', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );
@@ -704,7 +704,7 @@ describe('TypographyControlManager - Unit Tests', () => {
         });
 
         it('handles control boundary conditions', () => {
-            const manager = new TypographyControlManager(
+            const manager = new TypographySettingsManager(
                 DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
                 mockPersistentStore,
             );

src/features/SetupFont/model/index.ts

@@ -1,24 +1 @@
-export {
-    DEFAULT_FONT_SIZE,
-    DEFAULT_FONT_WEIGHT,
-    DEFAULT_LETTER_SPACING,
-    DEFAULT_LINE_HEIGHT,
-    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
-    FONT_SIZE_STEP,
-    FONT_WEIGHT_STEP,
-    LINE_HEIGHT_STEP,
-    MAX_FONT_SIZE,
-    MAX_FONT_WEIGHT,
-    MAX_LINE_HEIGHT,
-    MIN_FONT_SIZE,
-    MIN_FONT_WEIGHT,
-    MIN_LINE_HEIGHT,
-    MULTIPLIER_L,
-    MULTIPLIER_M,
-    MULTIPLIER_S,
-} from './const/const';
-
-export {
-    type ControlId,
-    controlManager,
-} from './state/manager.svelte';
+export { typographySettingsStore } from './state/typographySettingsStore';

src/features/SetupFont/model/state/manager.svelte.ts

@@ -1,6 +0,0 @@
-import { createTypographyControlManager } from '../../lib';
-import { DEFAULT_TYPOGRAPHY_CONTROLS_DATA } from '../const/const';
-
-export type ControlId = 'font_size' | 'font_weight' | 'line_height' | 'letter_spacing';
-
-export const controlManager = createTypographyControlManager(DEFAULT_TYPOGRAPHY_CONTROLS_DATA);

src/features/SetupFont/model/state/typographySettingsStore.ts

@@ -0,0 +1,7 @@
+import { DEFAULT_TYPOGRAPHY_CONTROLS_DATA } from '$entities/Font';
+import { createTypographySettingsManager } from '../../lib';
+
+export const typographySettingsStore = createTypographySettingsManager(
+    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
+    'glyphdiff:comparison:typography',
+);

src/features/SetupFont/ui/TypographyMenu/TypographyMenu.svelte

@@ -6,10 +6,14 @@
     Desktop: inline bar with combo controls.
 -->
 <script lang="ts">
+import {
+    MULTIPLIER_L,
+    MULTIPLIER_M,
+    MULTIPLIER_S,
+} from '$entities/Font';
 import type { ResponsiveManager } from '$shared/lib';
 import { cn } from '$shared/shadcn/utils/shadcn-utils';
 import {
-    Button,
     ComboControl,
     ControlGroup,
     Slider,
@@ -20,12 +24,7 @@ import { Popover } from 'bits-ui';
 import { getContext } from 'svelte';
 import { cubicOut } from 'svelte/easing';
 import { fly } from 'svelte/transition';
-import {
-    MULTIPLIER_L,
-    MULTIPLIER_M,
-    MULTIPLIER_S,
-    controlManager,
-} from '../../model';
+import { typographySettingsStore } from '../../model';
 
 interface Props {
     /**
@@ -52,16 +51,16 @@ $effect(() => {
     if (!responsive) return;
     switch (true) {
         case responsive.isMobile:
-            controlManager.multiplier = MULTIPLIER_S;
+            typographySettingsStore.multiplier = MULTIPLIER_S;
             break;
         case responsive.isTablet:
-            controlManager.multiplier = MULTIPLIER_M;
+            typographySettingsStore.multiplier = MULTIPLIER_M;
             break;
         case responsive.isDesktop:
-            controlManager.multiplier = MULTIPLIER_L;
+            typographySettingsStore.multiplier = MULTIPLIER_L;
             break;
         default:
-            controlManager.multiplier = MULTIPLIER_L;
+            typographySettingsStore.multiplier = MULTIPLIER_L;
     }
 });
 </script>
@@ -133,7 +132,7 @@ $effect(() => {
                     </div>
 
                     <!-- Controls -->
-                    {#each controlManager.controls as control (control.id)}
+                    {#each typographySettingsStore.controls as control (control.id)}
                         <ControlGroup label={control.controlLabel ?? ''}>
                             <Slider
                                 bind:value={control.instance.value}
@@ -174,7 +173,7 @@ $effect(() => {
                 </div>
 
                 <!-- Controls with dividers between each -->
-                {#each controlManager.controls as control, i (control.id)}
+                {#each typographySettingsStore.controls as control, i (control.id)}
                     {#if i > 0}
                         <div class="w-px h-6 md:h-8 bg-black/5 dark:bg-white/10 mx-0.5 md:mx-1 shrink-0"></div>
                     {/if}

src/widgets/ComparisonView/model/stores/comparisonStore.svelte.ts

@@ -21,10 +21,7 @@ import {
     fontStore,
     getFontUrl,
 } from '$entities/Font';
-import {
-    DEFAULT_TYPOGRAPHY_CONTROLS_DATA,
-    createTypographyControlManager,
-} from '$features/SetupFont';
+import { typographySettingsStore } from '$features/SetupFont/model';
 import { createPersistentStore } from '$shared/lib';
 import { untrack } from 'svelte';
 
@@ -68,8 +65,8 @@ export class ComparisonStore {
     #side = $state<Side>('A');
     /** Slider position for character morphing (0-100) */
     #sliderPosition = $state(50);
-    /** Typography controls for this comparison */
-    #typography = createTypographyControlManager(DEFAULT_TYPOGRAPHY_CONTROLS_DATA, 'glyphdiff:comparison:typography');
+    // /** Typography controls for this comparison */
+    // #typography = createTypographyControlManager(DEFAULT_TYPOGRAPHY_CONTROLS_DATA, 'glyphdiff:comparison:typography');
     /** TanStack Query-backed batch font fetcher */
     #batchStore: BatchFontStore;
 
@@ -99,7 +96,7 @@ export class ComparisonStore {
             $effect(() => {
                 const fa = this.#fontA;
                 const fb = this.#fontB;
-                const weight = this.#typography.weight;
+                const weight = typographySettingsStore.weight;
 
                 if (!fa || !fb) return;
 
@@ -137,6 +134,19 @@ export class ComparisonStore {
                     });
                 }
             });
+
+            // Effect 4: Pin fontA/fontB so eviction never removes on-screen fonts
+            $effect(() => {
+                const fa = this.#fontA;
+                const fb = this.#fontB;
+                const w = typographySettingsStore.weight;
+                if (fa) appliedFontsManager.pin(fa.id, w, fa.features?.isVariable);
+                if (fb) appliedFontsManager.pin(fb.id, w, fb.features?.isVariable);
+                return () => {
+                    if (fa) appliedFontsManager.unpin(fa.id, w, fa.features?.isVariable);
+                    if (fb) appliedFontsManager.unpin(fb.id, w, fb.features?.isVariable);
+                };
+            });
         });
     }
 
@@ -152,8 +162,8 @@ export class ComparisonStore {
             return;
         }
 
-        const weight = this.#typography.weight;
-        const size = this.#typography.renderedSize;
+        const weight = typographySettingsStore.weight;
+        const size = typographySettingsStore.renderedSize;
         const fontAName = this.#fontA?.name;
         const fontBName = this.#fontB?.name;
 
@@ -201,12 +211,12 @@ export class ComparisonStore {
         };
     }
 
-    // ── Getters / Setters ─────────────────────────────────────────────────────
+    // // ── Getters / Setters ─────────────────────────────────────────────────────
 
-    /** Typography control manager */
-    get typography() {
-        return this.#typography;
-    }
+    // /** Typography control manager */
+    // get typography() {
+    //     return typographySettingsStore;
+    // }
 
     /** Font for side A */
     get fontA() {
@@ -273,7 +283,7 @@ export class ComparisonStore {
         this.#fontB = undefined;
         this.#batchStore.setIds([]);
         storage.clear();
-        this.#typography.reset();
+        typographySettingsStore.reset();
     }
 }
 

src/widgets/ComparisonView/model/stores/comparisonStore.test.ts

@@ -53,15 +53,19 @@ vi.mock('$shared/lib/helpers/createPersistentStore/createPersistentStore.svelte'
 
 // ── $entities/Font mock — keep real BatchFontStore, stub singletons ───────────
 
-vi.mock('$entities/Font', async () => {
+vi.mock('$entities/Font', async importOriginal => {
+    const actual = await importOriginal<typeof import('$entities/Font')>();
     const { BatchFontStore } = await import(
         '$entities/Font/model/store/batchFontStore.svelte'
     );
     return {
+        ...actual,
         BatchFontStore,
         fontStore: { fonts: [] },
         appliedFontsManager: {
             touch: vi.fn(),
+            pin: vi.fn(),
+            unpin: vi.fn(),
             getFontStatus: vi.fn(),
             ready: vi.fn(() => Promise.resolve()),
         },
@@ -80,9 +84,20 @@ vi.mock('$features/SetupFont', () => ({
     })),
 }));
 
+vi.mock('$features/SetupFont/model', () => ({
+    typographySettingsStore: {
+        weight: 400,
+        renderedSize: 48,
+        reset: vi.fn(),
+    },
+}));
+
 // ── Imports (after mocks) ─────────────────────────────────────────────────────
 
-import { fontStore } from '$entities/Font';
+import {
+    appliedFontsManager,
+    fontStore,
+} from '$entities/Font';
 import * as proxyFonts from '$entities/Font/api/proxy/proxyFonts';
 import { ComparisonStore } from './comparisonStore.svelte';
 
@@ -209,4 +224,55 @@ describe('ComparisonStore', () => {
             expect(store.fontB).toBeUndefined();
         });
     });
+
+    // ── Pin / Unpin ───────────────────────────────────────────────────────────
+
+    describe('Pin / Unpin (eviction guard)', () => {
+        it('pins fontA and fontB when they are loaded', async () => {
+            mockStorage._value.fontAId = mockFontA.id;
+            mockStorage._value.fontBId = mockFontB.id;
+            vi.spyOn(proxyFonts, 'fetchFontsByIds').mockResolvedValue([mockFontA, mockFontB]);
+
+            new ComparisonStore();
+
+            await vi.waitFor(() => {
+                expect(appliedFontsManager.pin).toHaveBeenCalledWith(
+                    mockFontA.id,
+                    400,
+                    mockFontA.features?.isVariable,
+                );
+                expect(appliedFontsManager.pin).toHaveBeenCalledWith(
+                    mockFontB.id,
+                    400,
+                    mockFontB.features?.isVariable,
+                );
+            }, { timeout: 2000 });
+        });
+
+        it('unpins the old font when fontA is replaced', async () => {
+            mockStorage._value.fontAId = mockFontA.id;
+            mockStorage._value.fontBId = mockFontB.id;
+            vi.spyOn(proxyFonts, 'fetchFontsByIds').mockResolvedValue([mockFontA, mockFontB]);
+
+            const store = new ComparisonStore();
+            await vi.waitFor(() => expect(store.fontA?.id).toBe(mockFontA.id), { timeout: 2000 });
+
+            const mockFontC: typeof mockFontA = { ...mockFontA, id: 'playfair', name: 'Playfair Display' };
+            vi.spyOn(proxyFonts, 'fetchFontsByIds').mockResolvedValue([mockFontC, mockFontB]);
+            store.fontA = mockFontC;
+
+            await vi.waitFor(() => {
+                expect(appliedFontsManager.unpin).toHaveBeenCalledWith(
+                    mockFontA.id,
+                    400,
+                    mockFontA.features?.isVariable,
+                );
+                expect(appliedFontsManager.pin).toHaveBeenCalledWith(
+                    mockFontC.id,
+                    400,
+                    mockFontC.features?.isVariable,
+                );
+            }, { timeout: 2000 });
+        });
+    });
 });

src/widgets/ComparisonView/ui/Character/Character.svelte

@@ -3,6 +3,7 @@
     Renders a single character with morphing animation
 -->
 <script lang="ts">
+import { typographySettingsStore } from '$features/SetupFont';
 import { cn } from '$shared/shadcn/utils/shadcn-utils';
 import { comparisonStore } from '../../model';
 
@@ -25,7 +26,7 @@ let { char, proximity, isPast }: Props = $props();
 
 const fontA = $derived(comparisonStore.fontA);
 const fontB = $derived(comparisonStore.fontB);
-const typography = $derived(comparisonStore.typography);
+const typography = $derived(typographySettingsStore);
 
 let slot = $state<0 | 1>(0);
 let slotFonts = $state<[string, string]>(['', '']);

src/widgets/ComparisonView/ui/ComparisonView/ComparisonView.svelte

@@ -15,14 +15,13 @@ import {
     getContext,
     untrack,
 } from 'svelte';
-import { comparisonStore } from '../../model';
 import FontList from '../FontList/FontList.svelte';
 import Header from '../Header/Header.svelte';
 import Sidebar from '../Sidebar/Sidebar.svelte';
 import SliderArea from '../SliderArea/SliderArea.svelte';
 
 const responsive = getContext<ResponsiveManager>('responsive');
-const typography = $derived(comparisonStore.typography);
+// const typography = $derived(comparisonStore.typography);
 const isMobileOrTabletPortrait = $derived(responsive.isMobile || responsive.isTabletPortrait);
 let isSidebarOpen = $state(!isMobileOrTabletPortrait);
 
@@ -45,50 +44,51 @@ $effect(() => {
                         {#snippet main()}
                             <FontList />
                         {/snippet}
-
-                        {#snippet controls()}
-                            {#if typography.sizeControl && typography.weightControl && typography.heightControl && typography.spacingControl}
-                                <ControlGroup label="Size">
-                                    <Slider
-                                        bind:value={typography.sizeControl.value}
-                                        min={typography.sizeControl.min}
-                                        max={typography.sizeControl.max}
-                                        step={typography.sizeControl.step}
-                                    />
-                                </ControlGroup>
-
-                                <ControlGroup label="Weight">
-                                    <Slider
-                                        bind:value={typography.weightControl.value}
-                                        min={typography.weightControl.min}
-                                        max={typography.weightControl.max}
-                                        step={typography.weightControl.step}
-                                    />
-                                </ControlGroup>
-
-                                <div class="grid grid-cols-2 gap-6 mt-4">
-                                    <ControlGroup label="Leading" class="border-0 py-0">
+                        <!--
+                            {#snippet controls()}
+                                {#if typography.sizeControl && typography.weightControl && typography.heightControl && typography.spacingControl}
+                                    <ControlGroup label="Size">
                                         <Slider
-                                            bind:value={typography.heightControl.value}
-                                            min={typography.heightControl.min}
-                                            max={typography.heightControl.max}
-                                            step={typography.heightControl.step}
-                                            format={(v => v.toFixed(1))}
+                                            bind:value={typography.sizeControl.value}
+                                            min={typography.sizeControl.min}
+                                            max={typography.sizeControl.max}
+                                            step={typography.sizeControl.step}
                                         />
                                     </ControlGroup>
 
-                                    <ControlGroup label="Tracking" class="border-0 py-0">
+                                    <ControlGroup label="Weight">
                                         <Slider
-                                            bind:value={typography.spacingControl.value}
-                                            min={typography.spacingControl.min}
-                                            max={typography.spacingControl.max}
-                                            step={typography.spacingControl.step}
-                                            format={(v => v.toFixed(2))}
+                                            bind:value={typography.weightControl.value}
+                                            min={typography.weightControl.min}
+                                            max={typography.weightControl.max}
+                                            step={typography.weightControl.step}
                                         />
                                     </ControlGroup>
-                                </div>
-                            {/if}
-                        {/snippet}
+
+                                    <div class="grid grid-cols-2 gap-6 mt-4">
+                                        <ControlGroup label="Leading" class="border-0 py-0">
+                                            <Slider
+                                                bind:value={typography.heightControl.value}
+                                                min={typography.heightControl.min}
+                                                max={typography.heightControl.max}
+                                                step={typography.heightControl.step}
+                                                format={(v => v.toFixed(1))}
+                                            />
+                                        </ControlGroup>
+
+                                        <ControlGroup label="Tracking" class="border-0 py-0">
+                                            <Slider
+                                                bind:value={typography.spacingControl.value}
+                                                min={typography.spacingControl.min}
+                                                max={typography.spacingControl.max}
+                                                step={typography.spacingControl.step}
+                                                format={(v => v.toFixed(2))}
+                                            />
+                                        </ControlGroup>
+                                    </div>
+                                {/if}
+                            {/snippet}
+                        -->
                     </Sidebar>
                 {/snippet}
             </SidebarContainer>

src/widgets/ComparisonView/ui/FontList/FontList.svelte

@@ -4,6 +4,7 @@
 -->
 <script lang="ts">
 import {
+    DEFAULT_FONT_WEIGHT,
     FontApplicator,
     FontVirtualList,
     type UnifiedFont,
@@ -18,8 +19,6 @@ import { crossfade } from 'svelte/transition';
 import { comparisonStore } from '../../model';
 
 const side = $derived(comparisonStore.side);
-const typography = $derived(comparisonStore.typography);
-
 let prevIndexA: number | null = null;
 let prevIndexB: number | null = null;
 let selectedIndexA: number | null = null;
@@ -79,7 +78,7 @@ $effect(() => {
         </div>
         <FontVirtualList
             data-font-list
-            weight={typography.weight}
+            weight={DEFAULT_FONT_WEIGHT}
             itemHeight={45}
             class="bg-transparent min-h-0 h-full scroll-stable pr-4"
         >
@@ -95,7 +94,7 @@ $effect(() => {
                     class="w-full px-3 md:px-4 py-2.5 md:py-3 justify-between text-left text-sm flex"
                     iconPosition="right"
                 >
-                    <FontApplicator {font} weight={typography.weight}>{font.name}</FontApplicator>
+                    <FontApplicator {font}>{font.name}</FontApplicator>
 
                     {#snippet icon()}
                         {#if active}

src/widgets/ComparisonView/ui/Line/Line.svelte

@@ -3,8 +3,8 @@
     Renders a line of text in the SliderArea
 -->
 <script lang="ts">
+import { typographySettingsStore } from '$features/SetupFont';
 import type { Snippet } from 'svelte';
-import { comparisonStore } from '../../model';
 
 interface LineChar {
     char: string;
@@ -26,7 +26,7 @@ interface Props {
      */
     character: Snippet<[{ char: string; index: number }]>;
 }
-const typography = $derived(comparisonStore.typography);
+const typography = $derived(typographySettingsStore);
 
 let { chars, character }: Props = $props();
 </script>

src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte

@@ -8,6 +8,8 @@
     - Performance optimized using offscreen canvas for measurements and transform-based animations.
 -->
 <script lang="ts">
+import { TypographyMenu } from '$features/SetupFont';
+import { typographySettingsStore } from '$features/SetupFont/model';
 import {
     type ResponsiveManager,
     debounce,
@@ -42,7 +44,7 @@ let { isSidebarOpen = false, class: className }: Props = $props();
 const fontA = $derived(comparisonStore.fontA);
 const fontB = $derived(comparisonStore.fontB);
 const isLoading = $derived(comparisonStore.isLoading || !comparisonStore.isReady);
-const typography = $derived(comparisonStore.typography);
+const typography = $derived(typographySettingsStore);
 
 let container = $state<HTMLElement>();
 
@@ -179,12 +181,7 @@ const scaleClass = $derived(
     The paper div inside scales down when the sidebar opens on desktop.
 -->
 <div class={cn('flex-1 relative flex items-center justify-center p-0 overflow-hidden bg-surface dark:bg-dark-bg', className)}>
-    <!--
-        Paper surface.
-        Replaces the old glassmorphism card with a clean white/dark sheet.
-        Scale transition replaces motion.div spring — CSS transition-transform
-        is smooth enough here; a JS spring would add ~4kb for minimal gain.
-    -->
+    <!-- Paper surface -->
     <div
         class={cn(
             'w-full h-full flex flex-col items-center justify-center relative',
@@ -248,4 +245,10 @@ const scaleClass = $derived(
             {/if}
         </div>
     </div>
+
+    <TypographyMenu
+        class={cn(
+            'absolute bottom-4 sm:bottom-5 right-4 sm:left-1/2 sm:right-[unset] sm:-translate-x-1/2 z-50',
+        )}
+    />
 </div>

src/widgets/SampleList/ui/SampleList/SampleList.svelte

@@ -14,7 +14,7 @@ import {
 import { FontSampler } from '$features/DisplayFont';
 import {
     TypographyMenu,
-    controlManager,
+    typographySettingsStore,
 } from '$features/SetupFont';
 import { throttle } from '$shared/lib/utils';
 import { Skeleton } from '$shared/ui';
@@ -60,11 +60,11 @@ const checkPosition = throttle(() => {
 const fontRowHeight = $derived.by(() =>
     createFontRowSizeResolver({
         getFonts: () => fontStore.fonts,
-        getWeight: () => controlManager.weight,
+        getWeight: () => typographySettingsStore.weight,
         getPreviewText: () => text,
         getContainerWidth: () => containerWidth,
-        getFontSizePx: () => controlManager.renderedSize,
-        getLineHeightPx: () => controlManager.height * controlManager.renderedSize,
+        getFontSizePx: () => typographySettingsStore.renderedSize,
+        getLineHeightPx: () => typographySettingsStore.height * typographySettingsStore.renderedSize,
         getStatus: key => appliedFontsManager.statuses.get(key),
         contentHorizontalPadding: SAMPLER_CONTENT_PADDING_X,
         chromeHeight: SAMPLER_CHROME_HEIGHT,
@@ -97,7 +97,7 @@ const fontRowHeight = $derived.by(() =>
     <FontVirtualList
         itemHeight={fontRowHeight}
         useWindowScroll={true}
-        weight={controlManager.weight}
+        weight={typographySettingsStore.weight}
         columns={layoutManager.columns}
         gap={layoutManager.gap}
         {skeleton}