refactor(features): rename SetupFont to AdjustTypography + reorganize

Structural:
- Merge factory + singleton from lib/settingsManager and model/state into
  one model/store/typographySettingsStore/ slice
- Drop now-empty lib/ and model/state/ directories

Semantic:
- Rename feature SetupFont -> AdjustTypography (the feature owns
  continuous typography adjustment, not one-time font setup)
- Drop "Manager" from TypographySettingsManager -> TypographySettingsStore
  (class + factory); singleton typographySettingsStore unchanged

All consumers (Character, Line, SampleList, SliderArea, FontSampler,
comparisonStore) updated. Public barrel signature changed: now exports
createTypographySettingsStore and type TypographySettingsStore.

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

@@ -3,7 +3,7 @@
     Renders a single character with morphing animation
 -->
 <script lang="ts">
-import { typographySettingsStore } from '$features/SetupFont';
+import { typographySettingsStore } from '$features/AdjustTypography';
 import { cn } from '$shared/lib';
 import { comparisonStore } from '../../model';
 

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

@@ -3,7 +3,7 @@
     Renders a line of text in the SliderArea
 -->
 <script lang="ts">
-import { typographySettingsStore } from '$features/SetupFont';
+import { typographySettingsStore } from '$features/AdjustTypography';
 import type { Snippet } from 'svelte';
 
 interface LineChar {

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

@@ -8,8 +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 { TypographyMenu } from '$features/AdjustTypography';
+import { typographySettingsStore } from '$features/AdjustTypography/model';
 import {
     type ResponsiveManager,
     debounce,