feat: 增强 HomeScreen 录音交互与 ChatBloc 状态管理

- 新增录音启动延迟处理，解决权限未就绪时的竞态问题
- 实现历史分页滚动位置保持，提升加载体验
- 添加文本输入框点击键盘显示与焦点管理
- 优化 ChatBloc provider 到 MultiBlocProvider 支持
- 修复 ApiException 429 错误详情解析（支持 JSON 字符串 body）
- 改进 LocalNotificationService 精确闹钟权限请求
- 优化 UiSchemaRenderer GridView children 生成
- 支持导航 action 的 replace 参数
- 移除 Agent router 速率限制逻辑（_allow_run_request, _allow_transcribe_request）
- 补充相关单元测试与集成测试

apps/lib/core/notifications/local_notification_service.dart

@@ -1,12 +1,23 @@
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:flutter/foundation.dart';
 import 'package:timezone/data/latest.dart' as tz_data;
 import 'package:timezone/timezone.dart' as tz;
 
 import '../../features/calendar/data/models/schedule_item_model.dart';
 
+class NotificationScheduleException implements Exception {
+  final String message;
+
+  NotificationScheduleException(this.message);
+
+  @override
+  String toString() => message;
+}
+
 class LocalNotificationService {
   final FlutterLocalNotificationsPlugin _plugin;
   bool _initialized = false;
+  bool _exactAlarmPermissionRequested = false;
 
   LocalNotificationService({FlutterLocalNotificationsPlugin? plugin})
     : _plugin = plugin ?? FlutterLocalNotificationsPlugin();
@@ -27,17 +38,17 @@ class LocalNotificationService {
 
     await _plugin.initialize(settings);
 
-    await _plugin
+    final androidImpl = _plugin
         .resolvePlatformSpecificImplementation<
           AndroidFlutterLocalNotificationsPlugin
-        >()
-        ?.requestNotificationsPermission();
+        >();
+    await androidImpl?.requestNotificationsPermission();
 
-    await _plugin
+    final iosImpl = _plugin
         .resolvePlatformSpecificImplementation<
           IOSFlutterLocalNotificationsPlugin
-        >()
-        ?.requestPermissions(alert: true, badge: true, sound: true);
+        >();
+    await iosImpl?.requestPermissions(alert: true, badge: true, sound: true);
 
     _initialized = true;
   }
@@ -59,6 +70,41 @@ class LocalNotificationService {
 
     final notificationId = _notificationIdForEvent(event.id);
     final scheduledAt = tz.TZDateTime.from(fireAt, tz.local);
+    final androidImpl = _plugin
+        .resolvePlatformSpecificImplementation<
+          AndroidFlutterLocalNotificationsPlugin
+        >();
+
+    var androidScheduleMode = AndroidScheduleMode.exactAllowWhileIdle;
+    if (defaultTargetPlatform == TargetPlatform.android &&
+        androidImpl != null) {
+      var notificationsEnabled =
+          await androidImpl.areNotificationsEnabled() ?? false;
+      if (!notificationsEnabled) {
+        await androidImpl.requestNotificationsPermission();
+        notificationsEnabled =
+            await androidImpl.areNotificationsEnabled() ?? false;
+      }
+      if (!notificationsEnabled) {
+        throw NotificationScheduleException('系统通知权限未开启，无法创建提醒');
+      }
+
+      try {
+        var canScheduleExact =
+            await androidImpl.canScheduleExactNotifications() ?? false;
+        if (!canScheduleExact && !_exactAlarmPermissionRequested) {
+          _exactAlarmPermissionRequested = true;
+          await androidImpl.requestExactAlarmsPermission();
+          canScheduleExact =
+              await androidImpl.canScheduleExactNotifications() ?? false;
+        }
+        if (!canScheduleExact) {
+          androidScheduleMode = AndroidScheduleMode.inexactAllowWhileIdle;
+        }
+      } catch (_) {
+        androidScheduleMode = AndroidScheduleMode.inexactAllowWhileIdle;
+      }
+    }
 
     final details = NotificationDetails(
       android: AndroidNotificationDetails(
@@ -83,11 +129,20 @@ class LocalNotificationService {
         _buildReminderBody(event, reminderMinutes),
         scheduledAt,
         details,
-        androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
+        androidScheduleMode: androidScheduleMode,
         uiLocalNotificationDateInterpretation:
             UILocalNotificationDateInterpretation.absoluteTime,
       );
-    } catch (_) {
+
+      final pending = await _plugin.pendingNotificationRequests();
+      final scheduled = pending.any((item) => item.id == notificationId);
+      if (!scheduled) {
+        throw NotificationScheduleException('提醒未被系统接受，请检查系统通知和电池优化设置');
+      }
+    } catch (error) {
+      if (error is NotificationScheduleException) {
+        rethrow;
+      }
       await _plugin.zonedSchedule(
         notificationId,
         event.title,
@@ -98,6 +153,12 @@ class LocalNotificationService {
         uiLocalNotificationDateInterpretation:
             UILocalNotificationDateInterpretation.absoluteTime,
       );
+
+      final pending = await _plugin.pendingNotificationRequests();
+      final scheduled = pending.any((item) => item.id == notificationId);
+      if (!scheduled) {
+        throw NotificationScheduleException('提醒创建失败，请检查系统设置后重试');
+      }
     }
   }