Add launch configuration, update API keys, and refactor UI components for better structure and performance

lib/components/group/group_content.dart

@@ -5,9 +5,23 @@ class GroupContent extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(title: const Text('Chat Group Page')),
-      body: const Center(child: Text('This is the Chat Group Page')),
+    return const Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(Icons.group, size: 64, color: Colors.blue),
+          SizedBox(height: 16),
+          Text(
+            'Chat de Groupe',
+            style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
+          ),
+          SizedBox(height: 8),
+          Text(
+            'Communiquez avec vos compagnons de voyage',
+            style: TextStyle(fontSize: 16, color: Colors.grey),
+          ),
+        ],
+      ),
     );
   }
 }