refactor(features, widgets): update ThemeManager, FontSampler, FontSearch, and SampleList

src/features/ChangeAppTheme/ui/ThemeSwitch/ThemeSwitch.stories.svelte

@@ -23,25 +23,10 @@ const { Story } = defineMeta({
 
 <script lang="ts">
 import { themeManager } from '$features/ChangeAppTheme';
-import {
-    onDestroy,
-    onMount,
-} from 'svelte';
 
 // Current theme state for display
 const currentTheme = $derived(themeManager.value);
 const themeSource = $derived(themeManager.source);
-const isDark = $derived(themeManager.isDark);
-
-// Initialize themeManager on mount
-onMount(() => {
-    themeManager.init();
-});
-
-// Clean up themeManager when story unmounts
-onDestroy(() => {
-    themeManager.destroy();
-});
 </script>
 
 <Story name="Default">