Added details for chats with participants list

lib/widget/clickableAppBar.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+class ClickableAppBar extends StatelessWidget implements PreferredSizeWidget {
+  final VoidCallback onTap;
+  final AppBar appBar;
+  const ClickableAppBar({required this.onTap, required this.appBar, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(onTap: onTap, child: appBar);
+  }
+
+  @override
+  Size get preferredSize => appBar.preferredSize;
+}