feat: Add user-specific group retrieval and enhance UI with dynamic theming

lib/components/group/group_content.dart

@@ -22,11 +22,11 @@ class _GroupContentState extends State<GroupContent> {
           if (user == null || user.id == null) {
             return const Center(
               child: Text('Utilisateur non connecté'),
-              );
+            );
           }
 
           return StreamBuilder<List<Group>>(
-            stream: GroupService().getGroupsStream(),
+            stream: GroupService().getGroupsStreamByUser(user.id!), // Filtrer par utilisateur
             builder: (context, snapshot) {
               if (snapshot.connectionState == ConnectionState.waiting) {
                 return _buildLoadingState();
@@ -52,11 +52,11 @@ class _GroupContentState extends State<GroupContent> {
               } 
 
               final groups = snapshot.data ?? [];
-              print("Groupes reçus: ${groups.length}");
+              print("Groupes reçus pour l'utilisateur ${user.id}: ${groups.length}");
 
               return RefreshIndicator(
                 onRefresh: () async {
-                  setState() {};
+                  setState(() {});
                 },
                 child: SingleChildScrollView(
                   physics: const AlwaysScrollableScrollPhysics(),
@@ -74,13 +74,15 @@ class _GroupContentState extends State<GroupContent> {
                       ),
                       const SizedBox(height: 20),
                       groups.isEmpty ? _buildEmptyState() : _buildGroupList(groups),
+                      const SizedBox(height: 80),
                     ],
                   ),
                 ),
               );
             },
           );
-      }),
+        },
+      ),
     );
   }