feat: align iOS client safety and consent experience

health_app/lib/widgets/ai_consent_gate.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../core/app_colors.dart';
 import '../core/app_design_tokens.dart';
+import '../core/navigation_provider.dart';
 import '../providers/ai_consent_provider.dart';
 import '../providers/auth_provider.dart';
 import '../pages/settings/ai_consent_details_page.dart';
@@ -21,7 +22,9 @@ class _AiConsentGateState extends ConsumerState<AiConsentGate> {
   @override
   Widget build(BuildContext context) {
     final user = ref.watch(authProvider).user;
-    if (user == null || user.id.isEmpty) return widget.child;
+    if (user == null || user.id.isEmpty || user.role != 'User') {
+      return widget.child;
+    }
 
     if (_loadedUserId != user.id) {
       _loadedUserId = user.id;
@@ -31,17 +34,31 @@ class _AiConsentGateState extends ConsumerState<AiConsentGate> {
     }
 
     final consent = ref.watch(aiConsentProvider);
+    final currentRoute = ref.watch(currentRouteProvider).name;
+    final isConsentInformationRoute =
+        currentRoute == 'aiConsentDetails' || currentRoute == 'staticText';
     if (consent.userId != user.id || consent.isLoading) {
-      return const Scaffold(backgroundColor: Colors.white);
+      return const Scaffold(
+        body: Center(
+          child: CircularProgressIndicator(color: AppColors.primary),
+        ),
+      );
     }
-    if (consent.granted) return widget.child;
+    if (consent.granted || isConsentInformationRoute) return widget.child;
 
     return Scaffold(
-      backgroundColor: AppColors.background,
-      body: Center(
-        child: Padding(
-          padding: const EdgeInsets.all(24),
-          child: _ConsentCard(userId: user.id),
+      body: DecoratedBox(
+        decoration: const BoxDecoration(gradient: AppColors.bgGradient),
+        child: SafeArea(
+          child: Center(
+            child: SingleChildScrollView(
+              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 20),
+              child: ConstrainedBox(
+                constraints: const BoxConstraints(maxWidth: 400),
+                child: _ConsentCard(userId: user.id),
+              ),
+            ),
+          ),
         ),
       ),
     );
@@ -53,7 +70,12 @@ class _ConsentCard extends ConsumerWidget {
   const _ConsentCard({required this.userId});
 
   Future<void> _grant(BuildContext context, WidgetRef ref) async {
-    await ref.read(aiConsentProvider.notifier).grant(userId);
+    final succeeded = await ref.read(aiConsentProvider.notifier).grant(userId);
+    if (!succeeded && context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Authorization could not be saved.')),
+      );
+    }
   }
 
   Future<void> _decline(BuildContext context, WidgetRef ref) async {
@@ -62,64 +84,108 @@ class _ConsentCard extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    return Card(
-      elevation: 0,
-      color: Colors.white,
-      shape: RoundedRectangleBorder(borderRadius: AppRadius.xlBorder),
-      child: Padding(
-        padding: const EdgeInsets.fromLTRB(22, 24, 22, 20),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            const Icon(Icons.auto_awesome, size: 40, color: AppColors.primary),
-            const SizedBox(height: 14),
-            const Text(
-              'AI 健康服务授权',
-              textAlign: TextAlign.center,
-              style: TextStyle(fontSize: 21, fontWeight: FontWeight.w700),
+    final consent = ref.watch(aiConsentProvider);
+    return Container(
+      padding: const EdgeInsets.fromLTRB(20, 10, 20, 20),
+      decoration: BoxDecoration(
+        color: Colors.white.withValues(alpha: 0.96),
+        borderRadius: AppRadius.cardBorder,
+        border: Border.all(color: AppColors.primaryLight, width: 1),
+        boxShadow: AppShadows.panel,
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Align(
+            child: Image.asset(
+              'assets/branding/health_login_character_transparent.png',
+              height: 112,
+              fit: BoxFit.contain,
             ),
-            const SizedBox(height: 14),
-            const Text(
-              '小脉健康的核心功能使用第三方 AI 服务。经你同意后，你主动输入的健康信息、对话内容、图片和报告可能会发送给相关 AI 服务，用于健康记录、饮食识别、报告整理和 AI 回复。',
-              style: TextStyle(
-                fontSize: 15,
-                height: 1.6,
-                color: AppColors.textSecondary,
+          ),
+          const SizedBox(height: 2),
+          Align(
+            child: Container(
+              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+              decoration: BoxDecoration(
+                color: AppColors.primarySoft,
+                borderRadius: AppRadius.pillBorder,
+              ),
+              child: const Text(
+                'AI Service',
+                style: TextStyle(
+                  fontSize: 13,
+                  fontWeight: FontWeight.w600,
+                  color: AppColors.primaryDark,
+                ),
               ),
             ),
-            const SizedBox(height: 10),
-            const Text(
-              'AI 生成内容仅供健康管理参考，不能替代医生诊断或治疗。',
-              style: TextStyle(
-                fontSize: 14,
-                height: 1.5,
-                color: AppColors.textSecondary,
-              ),
-            ),
-            const SizedBox(height: 10),
-            TextButton(
-              onPressed: () {
-                Navigator.of(context).push(
-                  MaterialPageRoute<void>(
-                    builder: (_) => const AiConsentDetailsPage(),
+          ),
+          const SizedBox(height: 14),
+          Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 2),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                const Icon(
+                  Icons.auto_awesome,
+                  size: 40,
+                  color: AppColors.primary,
+                ),
+                const SizedBox(height: 14),
+                const Text(
+                  'AI 健康服务授权',
+                  textAlign: TextAlign.center,
+                  style: TextStyle(fontSize: 21, fontWeight: FontWeight.w700),
+                ),
+                const SizedBox(height: 14),
+                const Text(
+                  '小脉健康的核心功能使用第三方 AI 服务。经你同意后，你主动输入的健康信息、对话内容、图片和报告可能会发送给相关 AI 服务，用于健康记录、饮食识别、报告整理和 AI 回复。',
+                  style: TextStyle(
+                    fontSize: 15,
+                    height: 1.6,
+                    color: AppColors.textSecondary,
                   ),
-                );
-              },
-              child: const Text('查看《AI 数据处理说明》'),
+                ),
+                const SizedBox(height: 10),
+                const Text(
+                  'AI 生成内容仅供健康管理参考，不能替代医生诊断或治疗。',
+                  style: TextStyle(
+                    fontSize: 14,
+                    height: 1.5,
+                    color: AppColors.textSecondary,
+                  ),
+                ),
+                const SizedBox(height: 10),
+                TextButton(
+                  onPressed: () {
+                    Navigator.of(context).push(
+                      MaterialPageRoute<void>(
+                        builder: (_) => const AiConsentDetailsPage(),
+                      ),
+                    );
+                  },
+                  child: const Text('查看《AI 数据处理说明》'),
+                ),
+                const SizedBox(height: 8),
+                FilledButton(
+                  onPressed: consent.isSaving
+                      ? null
+                      : () => _grant(context, ref),
+                  child: const Text('同意并继续'),
+                ),
+                const SizedBox(height: 8),
+                OutlinedButton(
+                  onPressed: consent.isSaving
+                      ? null
+                      : () => _decline(context, ref),
+                  child: const Text('不同意并退出'),
+                ),
+              ],
             ),
-            const SizedBox(height: 8),
-            FilledButton(
-              onPressed: () => _grant(context, ref),
-              child: const Text('同意并继续'),
-            ),
-            const SizedBox(height: 8),
-            OutlinedButton(
-              onPressed: () => _decline(context, ref),
-              child: const Text('不同意并退出'),
-            ),
-          ],
-        ),
+          ),
+        ],
       ),
     );
   }