feat(notifications): add channel routing matrix, daily summary, and task watch button

frontend/src/lib/api.ts

@@ -35,6 +35,7 @@ import {
   TagSummary,
   User,
   UserInvite,
+  NotificationSettings,
   VoiceAdminStatus,
   MergeResult,
   WSMessage,
@@ -292,6 +293,7 @@ export const api = {
     discordWebhookUrl?: string;
     customWebhookUrl?: string;
     notifyBeforeMinutes?: number;
+    notificationSettings?: NotificationSettings;
   }): Promise<User> {
     return request<User>('/api/v1/auth/settings', {
       method: 'PATCH',
@@ -410,6 +412,18 @@ export const api = {
     return ensureArray(res);
   },
 
+  async watchTask(taskId: string): Promise<{ watching: boolean }> {
+    return request<{ watching: boolean }>(`/api/v1/tasks/${encodeURIComponent(taskId)}/watch`, {
+      method: 'POST',
+    });
+  },
+
+  async unwatchTask(taskId: string): Promise<{ watching: boolean }> {
+    return request<{ watching: boolean }>(`/api/v1/tasks/${encodeURIComponent(taskId)}/watch`, {
+      method: 'DELETE',
+    });
+  },
+
   async reorderTasks(items: { id: string; sortOrder: number; kanbanStatus?: string }[], taskListId?: string): Promise<{ success: boolean }> {
     const url = taskListId ? `/api/v1/task-lists/${taskListId}/tasks/reorder` : '/api/v1/tasks/reorder';
     return request<{ success: boolean }>(url, {