refactor(ui): update shared components and add ControlGroup, SidebarContainer

src/shared/ui/Footnote/Footnote.svelte

@@ -7,10 +7,16 @@ import { cn } from '$shared/shadcn/utils/shadcn-utils';
 import type { Snippet } from 'svelte';
 
 interface Props {
+    /**
+     * Content snippet
+     */
     children?: Snippet;
+    /**
+     * CSS classes
+     */
     class?: string;
     /**
-     * Custom render function for full control
+     * Custom render snippet
      */
     render?: Snippet<[{ class: string }]>;
 }