implemented comprehensive accessibility (A11y) support across the app

lib/view/pages/talk/search_chat.dart

@@ -25,7 +25,11 @@ class SearchChat extends SearchDelegate<GetRoomResponseObject?> {
   @override
   List<Widget>? buildActions(BuildContext context) => [
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        tooltip: 'Leeren',
+        onPressed: () => query = '',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override