feat(tasks): repeating tasks (daily, weekly, monthly, yearly)

- recurrence on tasks, set in the detail dialog; 🔁 on rows and Kanban cards
- Completing a repeating task (detail, list, Kanban drag to done, note
  checkbox) creates the next one: title, tags, priority, notes, list,
  assignees and rule copied, subtasks reset, first open column, due date
  one interval later (month end clamped); pushed live as TASK_CREATED
- Each task spawns at most once (re-open + complete makes no duplicate)
- Export/import keep the rule (Obsidian Tasks "🔁 every week", JSON field)

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

frontend/src/features/triage/TasksView.tsx

@@ -25,8 +25,9 @@ import {
   Folder,
   Filter,
   Webhook,
+  Repeat,
 } from 'lucide-react';
-import { TaskList, Thought, SubTask, Team, User, TaskListShare, TaskListMember, KanbanColumn, PriorityLevel } from '../../lib/types';
+import { TaskList, Thought, SubTask, Team, User, TaskListShare, TaskListMember, KanbanColumn, PriorityLevel, Recurrence, RECURRENCE_LABELS } from '../../lib/types';
 import { api, triggerHaptic } from '../../lib/api';
 import { UnifiedShareModal } from '../../components/UnifiedShareModal';
 import { TaskDetailModal } from './TaskDetailModal';
@@ -504,6 +505,15 @@ export const TasksView: React.FC<TasksViewProps> = ({
     await api.updateThought(task.id, { notes: newNotes });
   };
 
+  const handleUpdateTaskRecurrence = async (task: Thought, recurrence: Recurrence) => {
+    setTasks((prev) => prev.map((t) => (t.id === task.id ? { ...t, recurrence } : t)));
+    try {
+      await api.updateThought(task.id, { recurrence });
+    } catch {
+      setTasks((prev) => prev.map((t) => (t.id === task.id ? { ...t, recurrence: task.recurrence } : t)));
+    }
+  };
+
   const handleUpdateTaskAssignees = async (task: Thought, assignees: string[]) => {
     triggerHaptic(10);
     setTasks((prev) => prev.map((t) => (t.id === task.id ? { ...t, assignees } : t)));
@@ -1306,6 +1316,11 @@ export const TasksView: React.FC<TasksViewProps> = ({
                   <span>{task.dueDate}</span>
                 </span>
               )}
+              {task.recurrence && (
+                <span className="inline-flex items-center text-muted" title={`Wiederholt sich ${RECURRENCE_LABELS[task.recurrence]}`}>
+                  <Repeat className="w-3 h-3" />
+                </span>
+              )}
 
               {/* Hashtag badges */}
               {task.tags?.map((tag) => (
@@ -2131,6 +2146,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
         onUpdateStatus={handleSetKanbanStatus}
         onUpdatePriority={handleSetPriority}
         onUpdateDueDate={handleUpdateTaskDueDate}
+        onUpdateRecurrence={handleUpdateTaskRecurrence}
         onUpdateTaskList={handleUpdateTaskTaskList}
         onUpdateNotes={handleUpdateTaskNotes}
         onUpdateTags={handleUpdateTaskTags}
@@ -2324,6 +2340,11 @@ export const TasksView: React.FC<TasksViewProps> = ({
                               <span>{task.dueDate}</span>
                             </span>
                           )}
+                          {task.recurrence && (
+                            <span className="inline-flex items-center text-muted" title={`Wiederholt sich ${RECURRENCE_LABELS[task.recurrence]}`}>
+                              <Repeat className="w-2.5 h-2.5" />
+                            </span>
+                          )}
                           {task.tags?.map((tag) => (
                             <button
                               key={tag}