feat(hackathon): change "edit profile" to modal dialog

- Add "edit profile" modal dialog that can be triggered from dashboard
- Update background overlay for dark mode
- Update dark mode for auth callback

apps/hackathon/src/app/teams/[teamId]/page.tsx

@@ -194,7 +194,7 @@ const TeamDashboardPage: FC = (): ReactElement => {
         </div>
 
         {/* Loading Overlay */}
-        <div className="fixed inset-0 bg-white/60 flex items-center justify-center z-50">
+        <div className="fixed inset-0 bg-white/60 dark:bg-black/50 flex items-center justify-center z-50">
           <div className="text-center">
             <div className="inline-block animate-spin rounded-full h-12 w-12 border-4 border-blue-600 border-t-transparent"></div>
             <p className="mt-4 text-gray-600 dark:text-white">