feat: task trash, triage trash and retention settings for every area; admin can forbid keeping things for good

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/lib/api.ts

@@ -4,6 +4,8 @@ import {
   DashboardStats,
   Document,
   TrashedDocument,
+  TrashedTask,
+  Retention,
   JournalDay,
   PushDevice,
   BackupFile,
@@ -302,6 +304,7 @@ export const api = {
     notificationSettings?: NotificationSettings;
     doneRetentionDays?: number;
     voiceInput?: '' | 'browser';
+    retention?: Retention;
   }): Promise<User> {
     return request<User>('/api/v1/auth/settings', {
       method: 'PATCH',
@@ -479,6 +482,24 @@ export const api = {
     return request<{ deleted: number }>('/api/v1/tasks/clear-done', { method: 'POST', body: JSON.stringify({ taskListId }) });
   },
 
+  // Task trash: deleted tasks, cleared and automatically cleaned-up completed ones
+  async getTaskTrash(taskListId = ''): Promise<TrashedTask[]> {
+    const q = taskListId ? `?taskListId=${encodeURIComponent(taskListId)}` : '';
+    return request<TrashedTask[]>(`/api/v1/tasks/trash${q}`);
+  },
+
+  async restoreTrashedTask(id: string): Promise<Thought> {
+    return request<Thought>(`/api/v1/tasks/trash/${id}/restore`, { method: 'POST' });
+  },
+
+  async purgeTrashedTask(id: string): Promise<{ deleted: boolean }> {
+    return request<{ deleted: boolean }>(`/api/v1/tasks/trash/${id}`, { method: 'DELETE' });
+  },
+
+  async emptyTaskTrash(taskListId: string): Promise<{ deleted: number }> {
+    return request<{ deleted: number }>('/api/v1/tasks/trash/empty', { method: 'POST', body: JSON.stringify({ taskListId }) });
+  },
+
   async purgeDiscarded(): Promise<{ purged: number }> {
     return request<{ purged: number }>('/api/v1/thoughts/discarded/purge', { method: 'DELETE' });
   },