refactor(Font): rename fontStore and appliedFontsManager

Both names were vague or overloaded:

- fontStore / FontStore -> fontCatalogStore / FontCatalogStore
  Three font-related stores live in this slice; the new name names the
  paginated catalog specifically.

- appliedFontsManager / AppliedFontsManager -> fontLifecycleManager /
  FontLifecycleManager
  "Applied" collided with the filter-side appliedFilterStore (different
  meaning). The class actually orchestrates a load-use-evict lifecycle
  with FontBufferCache + FontEvictionPolicy + FontLoadQueue
  collaborators, so "Manager" is justified. Companion types file moved
  alongside (appliedFonts.ts -> fontLifecycle.ts).

Directories, file basenames, factory (createFontStore ->
createFontCatalogStore), and the AppliedFontsManagerDeps interface all
renamed. All consumers (ComparisonView, SampleList, FontList,
FontApplicator, FontVirtualList, FilterAndSortFonts bindings,
createFontRowSizeResolver, mocks) updated.

src/entities/Font/model/store/fontLifecycleManager/utils/fontEvictionPolicy/FontEvictionPolicy.test.ts

@@ -0,0 +1,69 @@
+import { FontEvictionPolicy } from './FontEvictionPolicy';
+
+describe('FontEvictionPolicy', () => {
+    let policy: FontEvictionPolicy;
+    const TTL = 1000;
+    const t0 = 100000;
+
+    beforeEach(() => {
+        policy = new FontEvictionPolicy({ ttl: TTL });
+    });
+
+    it('shouldEvict returns false within TTL', () => {
+        policy.touch('a@400', t0);
+        expect(policy.shouldEvict('a@400', t0 + TTL - 1)).toBe(false);
+    });
+
+    it('shouldEvict returns true at TTL boundary', () => {
+        policy.touch('a@400', t0);
+        expect(policy.shouldEvict('a@400', t0 + TTL)).toBe(true);
+    });
+
+    it('shouldEvict returns false for pinned key regardless of TTL', () => {
+        policy.touch('a@400', t0);
+        policy.pin('a@400');
+        expect(policy.shouldEvict('a@400', t0 + TTL * 10)).toBe(false);
+    });
+
+    it('shouldEvict returns true again after unpin past TTL', () => {
+        policy.touch('a@400', t0);
+        policy.pin('a@400');
+        policy.unpin('a@400');
+        expect(policy.shouldEvict('a@400', t0 + TTL)).toBe(true);
+    });
+
+    it('shouldEvict returns false for untracked key', () => {
+        expect(policy.shouldEvict('never@touched', t0 + TTL * 100)).toBe(false);
+    });
+
+    it('keys returns all tracked keys', () => {
+        policy.touch('a@400', t0);
+        policy.touch('b@vf', t0);
+        expect(Array.from(policy.keys())).toEqual(expect.arrayContaining(['a@400', 'b@vf']));
+    });
+
+    it('remove deletes key from tracking so it no longer appears in keys()', () => {
+        policy.touch('a@400', t0);
+        policy.touch('b@vf', t0);
+        policy.remove('a@400');
+        expect(Array.from(policy.keys())).not.toContain('a@400');
+        expect(Array.from(policy.keys())).toContain('b@vf');
+    });
+
+    it('remove unpins the key so a subsequent touch + TTL would evict it', () => {
+        policy.touch('a@400', t0);
+        policy.pin('a@400');
+        policy.remove('a@400');
+        // re-touch and check it can be evicted again
+        policy.touch('a@400', t0);
+        expect(policy.shouldEvict('a@400', t0 + TTL)).toBe(true);
+    });
+
+    it('clear resets all state', () => {
+        policy.touch('a@400', t0);
+        policy.pin('a@400');
+        policy.clear();
+        expect(Array.from(policy.keys())).toHaveLength(0);
+        expect(policy.shouldEvict('a@400', t0 + TTL * 10)).toBe(false);
+    });
+});

src/entities/Font/model/store/fontLifecycleManager/utils/fontEvictionPolicy/FontEvictionPolicy.ts

@@ -0,0 +1,88 @@
+interface FontEvictionPolicyOptions {
+    /**
+     * TTL in milliseconds. Defaults to 5 minutes.
+     */
+    ttl?: number;
+}
+
+/**
+ * Tracks font usage timestamps and pinned keys to determine when a font should be evicted.
+ *
+ * Pure data — no browser APIs. Accepts explicit `now` timestamps so tests
+ * never need fake timers.
+ */
+export class FontEvictionPolicy {
+    #usageTracker = new Map<string, number>();
+    #pinnedFonts = new Set<string>();
+
+    readonly #TTL: number;
+
+    constructor({ ttl = 5 * 60 * 1000 }: FontEvictionPolicyOptions = {}) {
+        this.#TTL = ttl;
+    }
+
+    /**
+     * Records the last-used time for a font key.
+     * @param key - Font key in `{id}@{weight}` or `{id}@vf` format.
+     * @param now - Current timestamp in ms. Defaults to `Date.now()`.
+     */
+    touch(key: string, now: number = Date.now()): void {
+        this.#usageTracker.set(key, now);
+    }
+
+    /**
+     * Pins a font key so it is never evicted regardless of TTL.
+     */
+    pin(key: string): void {
+        this.#pinnedFonts.add(key);
+    }
+
+    /**
+     * Unpins a font key, allowing it to be evicted once its TTL expires.
+     */
+    unpin(key: string): void {
+        this.#pinnedFonts.delete(key);
+    }
+
+    /**
+     * Returns `true` if the font should be evicted.
+     * A font is evicted when its TTL has elapsed and it is not pinned.
+     * Returns `false` for untracked keys.
+     *
+     * @param key - Font key to check.
+     * @param now - Current timestamp in ms (pass explicitly for deterministic tests).
+     */
+    shouldEvict(key: string, now: number): boolean {
+        const lastUsed = this.#usageTracker.get(key);
+        if (lastUsed === undefined) {
+            return false;
+        }
+        if (this.#pinnedFonts.has(key)) {
+            return false;
+        }
+        return now - lastUsed >= this.#TTL;
+    }
+
+    /**
+     * Returns an iterator over all tracked font keys.
+     */
+    keys(): IterableIterator<string> {
+        return this.#usageTracker.keys();
+    }
+
+    /**
+     * Removes a font key from tracking. Called by the orchestrator after eviction.
+     */
+    remove(key: string): void {
+        this.#usageTracker.delete(key);
+        this.#pinnedFonts.delete(key);
+    }
+
+    /**
+     * Clears all usage timestamps and pinned keys.
+     */
+    clear(): void {
+        this.#usageTracker.clear();
+        this.#pinnedFonts.clear();
+    }
+}