style: fix android dashboard title, enlarge icons, remove search delay

frontend/lib/ui/screens/dashboard/dashboard_screen.dart

@@ -556,14 +556,15 @@ class _DashboardScreenState extends ConsumerState<DashboardScreen> {
         mainAxisAlignment: MainAxisAlignment.spaceBetween,
         children: [
         if (!_searchFocusNode.hasFocus && _searchController.text.isEmpty) ...[
-          const Flexible(
-            child: FittedBox(
-              fit: BoxFit.scaleDown,
-              alignment: Alignment.centerLeft,
-              child: Text(
-                'Dashboard Overview',
-                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
+          Flexible(
+            child: Text(
+              'Dashboard Overview',
+              style: TextStyle(
+                fontSize: MediaQuery.of(context).size.width > 600 ? 24 : 18, 
+                fontWeight: FontWeight.bold,
               ),
+              maxLines: 2,
+              overflow: TextOverflow.visible,
             ),
           ),
           const SizedBox(width: 16),
@@ -600,7 +601,7 @@ class _DashboardScreenState extends ConsumerState<DashboardScreen> {
               Builder(builder: (ctx) => Stack(
                 children: [
                   IconButton(
-                    icon: const Icon(Icons.notifications, size: 28),
+                    icon: const Icon(Icons.notifications, size: 32),
                     onPressed: () => _showNotifications(ctx),
                   ),
                   if (unreadCount > 0)

frontend/lib/ui/shared/inputs/app_search_bar.dart

@@ -222,7 +222,7 @@ class _AppSearchBarState extends ConsumerState<AppSearchBar> {
           setState(() => _isExpanded = true);
           _focusNode.requestFocus();
         },
-        icon: const Icon(Icons.search, size: 28),
+        icon: const Icon(Icons.search, size: 32),
         tooltip: 'Search',
       );
     }
@@ -264,6 +264,7 @@ class _AppSearchBarState extends ConsumerState<AppSearchBar> {
                       widget.onChanged?.call('');
                       if (widget.collapsible) {
                         _focusNode.unfocus();
+                        _removeOverlay();
                         setState(() => _isExpanded = false);
                       } else {
                         _focusNode.requestFocus();