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

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

@@ -20,11 +20,18 @@ import {
 import { fly } from 'svelte/transition';
 
 interface Props {
-    /** Font info */
+    /**
+     * Font info
+     */
     font: UnifiedFont;
-    /** Editable sample text */
+    /**
+     * Sample text
+     */
     text: string;
-    /** Position index — drives the staggered entrance delay */
+    /**
+     * Position index
+     * @default 0
+     */
     index?: number;
 }