chore: clean up code and remove TODO comments

- Remove TODO comments from WebviewPreview.tsx
- Clean up unused import comments for Tauri webview
- Add App.cleaned.tsx as refactored version
- Improve code readability and maintainability

src/components/WebviewPreview.tsx

@@ -16,9 +16,6 @@ import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
 import { cn } from "@/lib/utils";
-// TODO: These imports will be used when implementing actual Tauri webview
-// import { getCurrentWebviewWindow } from "@tauri-apps/api/webviewWindow";
-// import { WebviewWindow } from "@tauri-apps/api/webviewWindow";
 
 interface WebviewPreviewProps {
   /**