added product import and billing integration

lib/presentation/auth/providers/auth_controller.dart

@@ -126,7 +126,14 @@ class AuthController extends StateNotifier<AuthState> {
     );
   }
 
-  void signOut() => state = const Unauthenticated();
+  /// The next shift should only ever bill against what the back office
+  /// answers with, never a catalogue instance carried over from this
+  /// session — so the local product table is dropped before the session
+  /// itself is.
+  Future<void> signOut() async {
+    await _ref.read(localStoreProvider).clearCatalogue();
+    state = const Unauthenticated();
+  }
 
   void clearError() {
     if (state is AuthFailure) state = const Unauthenticated();

lib/presentation/auth/screens/login_screen.dart

@@ -106,14 +106,7 @@ class _BrandPanel extends StatelessWidget {
                         borderRadius: BorderRadius.circular(11),
                       ),
                       alignment: Alignment.center,
-                      child: const Text(
-                        'N',
-                        style: TextStyle(
-                          color: AppColors.primary,
-                          fontSize: 23,
-                          fontWeight: FontWeight.w800,
-                        ),
-                      ),
+                      child: Image.asset('assets/images/logo.png', fit: BoxFit.contain),
                     ),
                     const SizedBox(width: AppSpacing.md),
                     const Flexible(