Add UserStateWrapper and ProfileImageService for user state management and profile image handling

lib/components/widgets/user_state_widget.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../blocs/user/user_bloc.dart';
+import '../../blocs/user/user_state.dart' as user_state;
+
+class UserStateWrapper extends StatelessWidget {
+  final Widget Function(BuildContext context, dynamic user) builder;
+  final Widget? loadingWidget;
+  final Widget? errorWidget;
+  final Widget? noUserWidget;
+
+  const UserStateWrapper({
+    super.key,
+    required this.builder,
+    this.loadingWidget,
+    this.errorWidget,
+    this.noUserWidget,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return BlocBuilder<UserBloc, user_state.UserState>(
+      builder: (context, state) {
+        if (state is user_state.UserLoading) {
+          return loadingWidget ??
+              const Center(child: CircularProgressIndicator());
+        }
+
+        if (state is user_state.UserError) {
+          return errorWidget ?? Center(child: Text('Erreur: ${state.message}'));
+        }
+
+        if (state is! user_state.UserLoaded) {
+          return noUserWidget ??
+              const Center(child: Text('Aucun utilisateur connecté.'));
+        }
+
+        return builder(context, state.user);
+      },
+    );
+  }
+}