fix(ui): add dark mode support to Input, Textarea and profile modal

- Add dark mode styling to Input component (bg, text, border, placeholder)
- Add dark mode styling to Textarea component
- Update profile page with blurred backdrop overlay
- Add shadow and proper dark mode to modal container

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/hackathon/src/app/profile/page.tsx

@@ -128,8 +128,8 @@ const ProfilePage: FC = (): ReactElement => {
   const isLoading = isUpdating || isUploading;
 
   return (
-    <div className="flex flex-col justify-center items-center min-h-screen bg-gray-50 dark:bg-neutral-950 px-4 py-8">
-      <div className="bg-white dark:bg-neutral-900 w-full max-w-md p-8 rounded-xl shadow-lg">
+    <div className="fixed inset-0 bg-black/30 dark:bg-black/50 backdrop-blur-sm flex flex-col justify-center items-center px-4 py-8 z-50 overflow-y-auto">
+      <div className="bg-white dark:bg-neutral-900 w-full max-w-md p-8 rounded-xl shadow-xl dark:shadow-neutral-950/50">
         <div className="mb-6">
           <div className="flex items-center justify-between mb-2">
             <h1 className="text-2xl font-bold text-gray-900 dark:text-white">Edit Profile</h1>