feat(apps): integrate auth cubits with register and login screens

apps/lib/features/auth/ui/screens/register_step2_screen.dart

@@ -1,29 +1,74 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:go_router/go_router.dart';
+import 'package:formz/formz.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../../../../shared/widgets/app_button.dart';
+import '../../../../shared/widgets/warning_banner.dart';
+import '../../presentation/cubits/register_cubit.dart';
+import '../../presentation/bloc/auth_bloc.dart';
+import '../../presentation/bloc/auth_event.dart';
 
-class RegisterStep2Screen extends StatefulWidget {
-  const RegisterStep2Screen({super.key});
+class RegisterStep2Screen extends StatelessWidget {
+  final RegisterCubit? cubit;
+
+  const RegisterStep2Screen({super.key, this.cubit});
 
   @override
-  State<RegisterStep2Screen> createState() => _RegisterStep2ScreenState();
+  Widget build(BuildContext context) {
+    final registerCubit =
+        cubit ?? (GoRouterState.of(context).extra as RegisterCubit?);
+
+    if (registerCubit == null) {
+      return Scaffold(
+        body: Center(child: Text('Error: RegisterCubit not found')),
+      );
+    }
+
+    return BlocProvider.value(
+      value: registerCubit,
+      child: const RegisterStep2View(),
+    );
+  }
 }
 
-class _RegisterStep2ScreenState extends State<RegisterStep2Screen> {
-  final _passwordController = TextEditingController();
+class RegisterStep2View extends StatefulWidget {
+  const RegisterStep2View({super.key});
+
+  @override
+  State<RegisterStep2View> createState() => _RegisterStep2ViewState();
+}
+
+class _RegisterStep2ViewState extends State<RegisterStep2View> {
   final _codeController = TextEditingController();
   final _inviteController = TextEditingController();
-  bool _obscureText = true;
 
   @override
   void dispose() {
-    _passwordController.dispose();
     _codeController.dispose();
     _inviteController.dispose();
     super.dispose();
   }
 
+  Future<void> _handleComplete() async {
+    final cubit = context.read<RegisterCubit>();
+    cubit.verificationCodeChanged(_codeController.text);
+
+    if (!cubit.state.isStep2Valid) {
+      return;
+    }
+
+    final response = await cubit.submitStep2();
+    if (response != null && mounted) {
+      context.read<AuthBloc>().add(AuthLoggedIn(user: response.user));
+      context.go('/home');
+    }
+  }
+
+  Future<void> _handleResendCode() async {
+    await context.read<RegisterCubit>().resendCode();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -96,62 +141,41 @@ class _RegisterStep2ScreenState extends State<RegisterStep2Screen> {
   }
 
   Widget _buildFormContainer() {
-    return SizedBox(
-      width: 327,
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.stretch,
-        children: [
-          _buildPasswordInput(),
-          const SizedBox(height: 12),
-          _buildCodeInput(),
-          const SizedBox(height: 12),
-          _buildInviteInput(),
-          const SizedBox(height: 12),
-          _buildStepIndicator(),
-          const SizedBox(height: 12),
-          AppButton(text: '完成注册', onPressed: () {}),
-        ],
-      ),
-    );
-  }
-
-  Widget _buildPasswordInput() {
-    return Column(
-      crossAxisAlignment: CrossAxisAlignment.start,
-      children: [
-        const Text(
-          '密码',
-          style: TextStyle(
-            fontSize: 13,
-            fontWeight: FontWeight.w500,
-            color: Color(0xFF475569),
-          ),
-        ),
-        const SizedBox(height: 6),
-        TextField(
-          controller: _passwordController,
-          obscureText: _obscureText,
-          decoration: InputDecoration(
-            hintText: '请输入至少 8 位密码',
-            suffixIcon: IconButton(
-              icon: Icon(
-                _obscureText ? Icons.visibility_off : Icons.visibility,
-                size: 20,
-                color: AppColors.slate400,
+    return BlocBuilder<RegisterCubit, RegisterState>(
+      builder: (context, state) {
+        return SizedBox(
+          width: 327,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              _buildCodeInput(state),
+              const SizedBox(height: 12),
+              _buildInviteInput(),
+              const SizedBox(height: 12),
+              _buildStepIndicator(),
+              if (state.errorMessage != null)
+                Padding(
+                  padding: const EdgeInsets.only(top: 8),
+                  child: WarningBanner(
+                    message: state.errorMessage!,
+                    visible: true,
+                  ),
+                ),
+              const SizedBox(height: 12),
+              AppButton(
+                text: '完成注册',
+                onPressed: state.status == FormzSubmissionStatus.inProgress
+                    ? null
+                    : _handleComplete,
               ),
-              onPressed: () {
-                setState(() {
-                  _obscureText = !_obscureText;
-                });
-              },
-            ),
+            ],
           ),
-        ),
-      ],
+        );
+      },
     );
   }
 
-  Widget _buildCodeInput() {
+  Widget _buildCodeInput(RegisterState state) {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
@@ -187,7 +211,9 @@ class _RegisterStep2ScreenState extends State<RegisterStep2Screen> {
               width: 112,
               height: 40,
               child: OutlinedButton(
-                onPressed: () {},
+                onPressed: state.status == FormzSubmissionStatus.inProgress
+                    ? null
+                    : _handleResendCode,
                 style: OutlinedButton.styleFrom(
                   backgroundColor: AppColors.background,
                   side: const BorderSide(color: AppColors.input),