perf(test): stop typographySettings pulling @tanstack for four constants

typographySettingsStore (and its spec) imported DEFAULT_FONT_* from the
$entities/Font root barrel, which re-exports FontVirtualList -> stores ->
@tanstack/query-core. Under Vitest (no tree-shaking) that loaded the entire
UI + TanStack graph just to read four constants.

Import them from the pure $entities/Font/model/const/const module instead.
Deep path is deliberate: it pulls only the constants, not the entity store
graph. Mitigates the test-side cost of audit D-1 (root barrel not yet
inert); the structural fix (inject stores into FontVirtualList) stays
parked.

src/features/AdjustTypography/model/store/typographySettingsStore/typographySettingsStore.svelte.ts

@@ -15,7 +15,10 @@ import {
     DEFAULT_FONT_WEIGHT,
     DEFAULT_LETTER_SPACING,
     DEFAULT_LINE_HEIGHT,
-} from '$entities/Font';
+    // Deep path (not the root barrel) on purpose: pulls only these pure
+    // constants, not the entity's UI/store graph (+ @tanstack) — keeps this
+    // feature store and its spec light at import. See audit D-1.
+} from '$entities/Font/model/const/const';
 import {
     type PersistentStore,
     createPersistentStore,

src/features/AdjustTypography/model/store/typographySettingsStore/typographySettingsStore.test.ts

@@ -6,7 +6,7 @@ import {
     DEFAULT_FONT_WEIGHT,
     DEFAULT_LETTER_SPACING,
     DEFAULT_LINE_HEIGHT,
-} from '$entities/Font';
+} from '$entities/Font/model/const/const';
 import {
     beforeEach,
     describe,