feat: enhance task item UX with Notion drag handle, F2 edit, and floating undo toast (v0.6.3)

.cline-context.md

@@ -28,6 +28,12 @@
   - Refined `docker-compose.yml` and `.env.example` to support standalone 2-file deployment (`docker-compose.yml` + `.env`) without cloning source code, public registry images (`CHECKFLOW_IMAGE`), Watchtower auto-updating labels, and automated database migrations.
   - Automated Gitea Actions CI workflow (`.gitea/workflows/docker-build.yaml`) for building & pushing container images to Gitea Container Registry with lowercase repository name normalization (`env.REPO`) and OCI source labels (`org.opencontainers.image.source`) for automatic repository package linkage.
   - Completely revamped `README.md` to reflect universal 2-file Docker deployment for general users, Watchtower auto-update, architecture, and open-standard CalDAV sync guidelines.
+  - **Enhanced Task Row UX & Interactive Undo Toast (v0.6.3)**:
+    - Added Notion-style 6-dot drag handle on each task row with drag-and-drop task reordering.
+    - Added `F2` shortcut key and double-click to trigger inline title editing.
+    - Moved "+ Subtask" button to the right-aligned hover area and removed redundant explicit edit pencil button.
+    - Implemented floating interactive Undo Toast banner with 6-second grace period for soft delete and instant undo.
+    - Fixed Trash and task tree duplicate rendering in LocalStorage demo store.
   - Validated that `npm run lint` and `npm run build` execute with 0 errors and 0 warnings.
 
 - **Next Steps (Todo):**

AGENTS.md

@@ -81,7 +81,8 @@ src/
 | `checkpoint-v0.5.0` | VSCode 무채색 다크 테마, 에디터 조잡한 툴바 제거 & 순수 캔버스 전환, 모듈형 블록 커스텀 (서브태스크 ↔ 노트 순서 스왑 및 스플릿 리사이저 높이 조절), CheckFlow Labs (3컬럼 칸반 보드 뷰), 기본값 복원(Reset to Defaults), 보안 패치 완료 | 2026-08-21 |
 | `checkpoint-v0.6.0` | 글로벌 `UserPrefs` 시스템(`userPrefs.ts` / `useUserPrefs.ts`) 도입, 사이드바 드래그 리사이저, 디테일 패널 드래그 리사이저, Labs 탭 확장(밀도/폰트/라운드/애니메이션/색조/채도/패널 너비), 뷰 전환(리스트↔칸반) 실시간 반응, 파스텔 매트 라이트 팔레트 적용 | 2026-08-21 |
 | `checkpoint-v0.6.1` | CalDAV / DAVx⁵ 양방향 동기화 프로토콜 고도화(OPTIONS, PROPFIND, REPORT, PUT, DELETE), 설정 모달 내 플랫폼별(Android DAVx⁵ / Apple Reminders / Thunderbird) 인터랙티브 가이드 및 실시간 엔드포인트 테스트 핑, 다국어 i18n 동기화 | 2026-08-21 |
-| `checkpoint-v0.6.2` | **(현재 최신)** 표준 태스크 내보내기(Export) 기능 구현: TickTick/RFC 4180 호환 CSV (UTF-8 BOM 포함) 및 RFC 5545 iCalendar (`.ics` VTODO), 사이드바 프로필 메뉴 연동, 데모 모드 로컬 Blob 내보내기 지원, 다국어 사전 동기화 | 2026-08-21 |
+| `checkpoint-v0.6.2` | 표준 태스크 내보내기(Export) 기능 구현: TickTick/RFC 4180 호환 CSV (UTF-8 BOM 포함) 및 RFC 5545 iCalendar (`.ics` VTODO), 사이드바 프로필 메뉴 연동, 데모 모드 로컬 Blob 내보내기 지원, 다국어 사전 동기화 | 2026-08-21 |
+| `checkpoint-v0.6.3` | **(현재 최신)** 노션 스타일 6도트 드래그 핸들(`⋮⋮`) & DND 태스크 재정렬, F2 단축키 인라인 제목 수정, 우측 호버 서브태스크 추가 버튼, 6초 플로팅 인터랙티브 실행 취소(Undo) 토스트 배너 탑재, 휴지통 및 로컬 스토리지 트리 중복 버그 수정 | 2026-08-21 |
 
 ---
 

src/app/globals.css

@@ -157,48 +157,212 @@ a { color: inherit; text-decoration: none; }
 }
 
 /* ============================================
-   SIDEBAR
+   TOAST / NOTIFICATIONS & UNDO BANNER
    ============================================ */
-.sidebar {
-  width: var(--sidebar-width);
-  background: var(--bg-sidebar);
-  border-right: 1px solid var(--border);
+.toast-container {
+  position: fixed;
+  bottom: 24px;
+  right: 24px;
   display: flex;
   flex-direction: column;
-  flex-shrink: 0;
-  overflow: hidden;
-  transition: width var(--dur-slow) var(--ease-out),
-              transform var(--dur-slow) var(--ease-out);
-  z-index: 20;
-  min-width: 0;
+  gap: 8px;
+  z-index: 200;
+  pointer-events: none;
 }
 
-.sidebar.collapsed {
-  width: 0;
-}
-
-.sidebar-header {
+.toast {
+  background: var(--text-primary);
+  color: var(--bg-primary);
+  padding: 10px 16px;
+  border-radius: var(--radius-md);
+  font-size: 13.5px;
+  font-weight: 500;
+  box-shadow: var(--shadow-md);
   display: flex;
   align-items: center;
   gap: 10px;
-  padding: 16px 16px 12px;
-  border-bottom: 1px solid var(--border);
-  min-height: var(--header-height);
+  animation: toastIn var(--dur-normal) var(--ease-out);
+  pointer-events: all;
 }
 
-.sidebar-logo {
-  width: 28px;
-  height: 28px;
-  background: var(--accent);
-  border-radius: var(--radius-sm);
+.toast-btn {
+  color: var(--accent);
+  font-weight: 600;
+  font-size: 13px;
+  padding: 2px 6px;
+  border-radius: var(--radius-xs);
+  transition: background var(--dur-fast);
+}
+
+.toast-btn:hover { background: rgba(255,255,255,0.15); }
+
+@keyframes toastIn {
+  from { opacity: 0; transform: translateY(12px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+/* Notion-style Task Drag Handle */
+.task-drag-handle {
+  width: 16px;
+  height: 20px;
   display: flex;
   align-items: center;
   justify-content: center;
-  color: white;
-  font-size: 14px;
-  font-weight: 700;
-  letter-spacing: -0.5px;
+  color: var(--text-tertiary);
+  opacity: 0;
+  cursor: grab;
+  transition: opacity var(--dur-fast), color var(--dur-fast), transform var(--dur-fast);
   flex-shrink: 0;
+  margin-left: -4px;
+  margin-right: 2px;
+  user-select: none;
+}
+
+.task-item:hover .task-drag-handle {
+  opacity: 0.7;
+}
+
+.task-drag-handle:hover {
+  opacity: 1 !important;
+  color: var(--accent);
+  transform: scale(1.15);
+}
+
+.task-drag-handle:active {
+  cursor: grabbing;
+}
+
+/* Dragging & Reorder Feedback */
+.task-item.is-dragging {
+  opacity: 0.4;
+  background: var(--bg-active);
+  box-shadow: var(--shadow-md);
+}
+
+.task-item.drag-over-top {
+  border-top: 2px solid var(--accent) !important;
+}
+
+.task-item.drag-over-bottom {
+  border-bottom: 2px solid var(--accent) !important;
+}
+
+/* Right-aligned task actions hover container */
+.task-actions-right {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  margin-left: auto;
+  opacity: 0;
+  transition: opacity var(--dur-fast);
+}
+
+.task-item:hover .task-actions-right {
+  opacity: 1;
+}
+
+.task-item:focus-within .task-actions-right {
+  opacity: 1;
+}
+
+/* Floating Interactive Undo Toast Banner */
+.undo-toast-banner {
+  position: fixed;
+  bottom: 28px;
+  left: 50%;
+  transform: translateX(-50%);
+  background: var(--bg-secondary);
+  color: var(--text-primary);
+  border: 1px solid var(--border-medium);
+  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15), 0 2px 8px rgba(0, 0, 0, 0.08);
+  padding: 10px 18px;
+  border-radius: var(--radius-full);
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  z-index: 300;
+  animation: undoToastIn 280ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
+  backdrop-filter: blur(12px);
+  min-width: 320px;
+  max-width: 90vw;
+  justify-content: space-between;
+}
+
+[data-theme="dark"] .undo-toast-banner {
+  background: #252526;
+  border-color: #3e3e42;
+  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.6), 0 4px 12px rgba(0, 0, 0, 0.4);
+}
+
+.undo-toast-content {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  font-size: 13.5px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.undo-toast-icon {
+  font-size: 16px;
+}
+
+.undo-toast-msg strong {
+  font-weight: 600;
+  color: var(--accent);
+}
+
+.undo-toast-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-shrink: 0;
+}
+
+.undo-toast-btn {
+  background: var(--accent);
+  color: white;
+  font-weight: 600;
+  font-size: 12.5px;
+  padding: 4px 12px;
+  border-radius: var(--radius-full);
+  transition: transform var(--dur-fast), filter var(--dur-fast), background var(--dur-fast);
+  cursor: pointer;
+}
+
+.undo-toast-btn:hover {
+  filter: brightness(1.1);
+  transform: translateY(-1px);
+}
+
+.undo-toast-btn:active {
+  transform: translateY(0);
+}
+
+.undo-toast-close {
+  color: var(--text-tertiary);
+  font-size: 12px;
+  padding: 4px 6px;
+  border-radius: var(--radius-full);
+  cursor: pointer;
+  transition: color var(--dur-fast), background var(--dur-fast);
+}
+
+.undo-toast-close:hover {
+  color: var(--text-primary);
+  background: var(--bg-hover);
+}
+
+@keyframes undoToastIn {
+  from {
+    opacity: 0;
+    transform: translate(-50%, 24px) scale(0.94);
+  }
+  to {
+    opacity: 1;
+    transform: translate(-50%, 0) scale(1);
+  }
 }
 
 .sidebar-title {

src/components/layout/AppShell.tsx

@@ -299,16 +299,91 @@ export function AppShell({ user, isDemo = false }: AppShellProps) {
     handleTaskUpdate(updated);
   };
 
+  // Undo Toast state
+  const [undoToast, setUndoToast] = useState<{ task: Task; title: string } | null>(null);
+  const undoTimerRef = useRef<NodeJS.Timeout | null>(null);
+
+  // Unified task delete handler with immediate Undo Toast
+  const handleDeleteTaskWithUndo = useCallback((task: Task) => {
+    if (undoTimerRef.current) clearTimeout(undoTimerRef.current);
+
+    setUndoToast({ task, title: task.title });
+
+    if (isDemo) {
+      const store = getDemoStore();
+      const newTasks = moveToTrashInTree(store.tasks, task.id);
+      saveDemoStore(store.lists, newTasks);
+      setTasks((prev) => prev.filter((t) => t.id !== task.id));
+      if (selectedTask?.id === task.id) setSelectedTask(null);
+    } else {
+      setTasks((prev) => prev.filter((t) => t.id !== task.id));
+      if (selectedTask?.id === task.id) setSelectedTask(null);
+      fetch(`/api/tasks/${task.id}`, { method: "DELETE" }).catch((e) => console.error(e));
+    }
+
+    undoTimerRef.current = setTimeout(() => {
+      setUndoToast(null);
+    }, 6000);
+  }, [isDemo, selectedTask]);
+
+  // Undo delete
+  const handleUndoDelete = useCallback(async () => {
+    if (!undoToast) return;
+    if (undoTimerRef.current) clearTimeout(undoTimerRef.current);
+    const { task } = undoToast;
+    setUndoToast(null);
+
+    if (isDemo) {
+      const store = getDemoStore();
+      const newTasks = restoreTaskInTree(store.tasks, task.id);
+      saveDemoStore(store.lists, newTasks);
+      if (task.listId === selectedListId) {
+        setTasks((prev) => {
+          if (prev.some((t) => t.id === task.id)) return prev;
+          return [...prev, { ...task, isDeleted: false, deletedAt: null }];
+        });
+      }
+      refresh();
+    } else {
+      try {
+        const res = await fetch("/api/tasks", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({
+            title: task.title,
+            listId: task.listId,
+            parentId: task.parentId,
+            note: task.note,
+            completed: task.completed,
+            dueDate: task.dueDate,
+            priority: task.priority,
+          }),
+        });
+        if (res.ok) {
+          const created = await res.json();
+          if (created.listId === selectedListId) {
+            setTasks((prev) => [...prev, created]);
+          }
+          refresh();
+        }
+      } catch (err) {
+        console.error("Failed to restore task", err);
+      }
+    }
+  }, [undoToast, isDemo, selectedListId, refresh]);
+
   // Move to Trash (Soft Delete)
   const handleDemoDeleteTask = (id: string) => {
     const store = getDemoStore();
+    const target = findTaskInTree(store.tasks, id);
+    if (target) {
+      handleDeleteTaskWithUndo(target as Task);
+    } else {
       const newTasks = moveToTrashInTree(store.tasks, id);
       saveDemoStore(store.lists, newTasks);
       setTasks((prev) => prev.filter((t) => t.id !== id));
-    if (selectedTask?.id === id) {
-      setSelectedTask(null);
+      if (selectedTask?.id === id) setSelectedTask(null);
     }
-    refresh();
   };
 
   // Restore from Trash
@@ -435,7 +510,7 @@ export function AppShell({ user, isDemo = false }: AppShellProps) {
 
       <div className="main-content">
         <TaskList
-          key={`${selectedListId}-${isTrashActive}-${selectedTag}-${refreshKey}`}
+          key={`${selectedListId}-${isTrashActive}-${selectedTag}`}
           user={user}
           listId={selectedListId}
           lists={lists}
@@ -457,6 +532,7 @@ export function AppShell({ user, isDemo = false }: AppShellProps) {
           onDemoToggleTask={handleDemoToggleTask}
           onUpdateTaskTitle={handleUpdateTaskTitle}
           onUpdateListName={handleUpdateListName}
+          onDeleteTaskWithUndo={handleDeleteTaskWithUndo}
           onDeleteTask={isDemo ? handleDemoDeleteTask : async (id: string) => {
             await fetch(`/api/tasks/${id}`, { method: "DELETE" });
             refresh();
@@ -524,6 +600,34 @@ export function AppShell({ user, isDemo = false }: AppShellProps) {
         onSelectTask={handleTaskSelect}
       />
 
+      {/* Interactive Undo Toast Banner */}
+      {undoToast && (
+        <div className="undo-toast-banner" role="alert">
+          <div className="undo-toast-content">
+            <span className="undo-toast-icon">🗑️</span>
+            <span className="undo-toast-msg">
+              <strong>{undoToast.title || "할 일"}</strong>이(가) 삭제되었습니다.
+            </span>
+          </div>
+          <div className="undo-toast-actions">
+            <button type="button" className="undo-toast-btn" onClick={handleUndoDelete}>
+              실행 취소
+            </button>
+            <button
+              type="button"
+              className="undo-toast-close"
+              onClick={() => {
+                if (undoTimerRef.current) clearTimeout(undoTimerRef.current);
+                setUndoToast(null);
+              }}
+              title="닫기"
+            >
+              ✕
+            </button>
+          </div>
+        </div>
+      )}
+
       {/* Mobile FAB */}
       <button
         className="fab"

src/components/tasks/TaskList.tsx

@@ -43,6 +43,7 @@ interface TaskItemProps {
   isTrashMode?: boolean;
   onRestore?: (id: string) => void;
   onPermanentDelete?: (id: string) => void;
+  onDragTask?: (draggedId: string, targetId: string, position: "before" | "after") => void;
 }
 
 // Recursive Task Tree Item (Supports 1st, 2nd, 3rd, N-level sub-tasks seamlessly)
@@ -58,6 +59,7 @@ function RecursiveTaskItem({
   isTrashMode = false,
   onRestore,
   onPermanentDelete,
+  onDragTask,
 }: TaskItemProps) {
   const { t, lang } = useI18n();
   const [expanded, setExpanded] = useState(true);
@@ -154,11 +156,21 @@ function RecursiveTaskItem({
     touchStartX.current = null;
   };
 
+  const [dragOverPos, setDragOverPos] = useState<"top" | "bottom" | null>(null);
+
   return (
     <div style={{ paddingLeft: depth > 0 ? 24 : 0, position: "relative" }}>
       <div
-        className={`task-item${task.completed ? " completed" : ""}${isSelected ? " selected" : ""}`}
+        className={`task-item${task.completed ? " completed" : ""}${isSelected ? " selected" : ""}${dragOverPos ? ` drag-over-${dragOverPos}` : ""}`}
         onClick={() => onSelect(task)}
+        tabIndex={0}
+        onKeyDown={(e) => {
+          if (e.key === "F2" && !isTrashMode) {
+            e.preventDefault();
+            e.stopPropagation();
+            setEditingTitle(true);
+          }
+        }}
         onTouchStart={handleTouchStart}
         onTouchMove={handleTouchMove}
         onTouchEnd={handleTouchEnd}
@@ -167,6 +179,24 @@ function RecursiveTaskItem({
           e.stopPropagation();
           onContextMenu(e.clientX, e.clientY, task);
         }}
+        onDragOver={(e) => {
+          if (isTrashMode) return;
+          e.preventDefault();
+          e.dataTransfer.dropEffect = "move";
+          const rect = e.currentTarget.getBoundingClientRect();
+          const mid = rect.top + rect.height / 2;
+          setDragOverPos(e.clientY < mid ? "top" : "bottom");
+        }}
+        onDragLeave={() => setDragOverPos(null)}
+        onDrop={(e) => {
+          if (isTrashMode) return;
+          e.preventDefault();
+          const draggedId = e.dataTransfer.getData("text/plain");
+          if (draggedId && draggedId !== task.id && onDragTask) {
+            onDragTask(draggedId, task.id, dragOverPos === "top" ? "before" : "after");
+          }
+          setDragOverPos(null);
+        }}
         id={`task-${task.id}`}
         style={{
           borderLeft: depth > 0 ? "2px solid var(--border)" : "none",
@@ -175,6 +205,30 @@ function RecursiveTaskItem({
           transition: swipeOffset === 0 ? "transform 0.2s cubic-bezier(0.16, 1, 0.3, 1)" : "none",
         }}
       >
+        {/* Notion-style 6-dot Drag Handle */}
+        {!isTrashMode && (
+          <div
+            className="task-drag-handle"
+            draggable
+            onDragStart={(e) => {
+              e.stopPropagation();
+              e.dataTransfer.setData("text/plain", task.id);
+              e.dataTransfer.effectAllowed = "move";
+            }}
+            title="Drag to reorder"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <svg width="12" height="12" viewBox="0 0 16 16" fill="currentColor">
+              <circle cx="5" cy="3" r="1.5" />
+              <circle cx="11" cy="3" r="1.5" />
+              <circle cx="5" cy="8" r="1.5" />
+              <circle cx="11" cy="8" r="1.5" />
+              <circle cx="5" cy="13" r="1.5" />
+              <circle cx="11" cy="13" r="1.5" />
+            </svg>
+          </div>
+        )}
+
         {/* Toggle Expand Arrow if has children */}
         {totalChildren > 0 ? (
           <button
@@ -246,7 +300,7 @@ function RecursiveTaskItem({
                 e.stopPropagation();
                 setEditingTitle(true);
               }}
-              title="Double click to edit"
+              title="Double click or press F2 to edit"
               style={{ fontSize: depth > 0 ? 13 : 14, fontWeight: depth === 0 ? 600 : 500 }}
             >
               {task.title}
@@ -310,23 +364,6 @@ function RecursiveTaskItem({
                 ))}
               </div>
             )}
-
-            {/* Quick Inline Add Subtask button */}
-            {!isTrashMode && (
-              <button
-                className="badge badge-neutral"
-                style={{ cursor: "pointer", fontSize: 10, padding: "1px 6px", border: "1px solid var(--border)", background: "transparent" }}
-                onClick={(e) => {
-                  e.stopPropagation();
-                  setAddingSubtask(true);
-                  setExpanded(true);
-                }}
-                title="Add subtask"
-                type="button"
-              >
-                + {t("subtasks")}
-              </button>
-            )}
           </div>
 
           {task.note && !task.completed && depth === 0 && (
@@ -334,9 +371,9 @@ function RecursiveTaskItem({
           )}
         </div>
 
-        {/* Trash Mode Actions or Edit Icon */}
+        {/* Right Actions: Subtask Add Button & Trash Mode Controls */}
         {isTrashMode ? (
-          <div style={{ display: "flex", gap: 6 }}>
+          <div style={{ display: "flex", gap: 6, marginLeft: "auto" }}>
             <button
               className="btn btn-ghost btn-sm"
               style={{ fontSize: 11, padding: "2px 8px" }}
@@ -363,20 +400,27 @@ function RecursiveTaskItem({
             </button>
           </div>
         ) : (
+          <div className="task-actions-right">
             <button
-            className="icon-btn"
-            style={{ width: 22, height: 22, opacity: 0.35, flexShrink: 0 }}
+              className="badge badge-neutral"
+              style={{
+                cursor: "pointer",
+                fontSize: 11,
+                padding: "2px 8px",
+                border: "1px solid var(--border)",
+                background: "var(--bg-secondary)",
+              }}
               onClick={(e) => {
                 e.stopPropagation();
-              setEditingTitle(true);
+                setAddingSubtask(true);
+                setExpanded(true);
               }}
-            title="Edit title"
+              title="Add subtask"
               type="button"
             >
-            <svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
-              <path d="M12 20h9" /><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z" />
-            </svg>
+              + {t("subtasks")}
             </button>
+          </div>
         )}
       </div>
 
@@ -397,6 +441,7 @@ function RecursiveTaskItem({
               isTrashMode={isTrashMode}
               onRestore={onRestore}
               onPermanentDelete={onPermanentDelete}
+              onDragTask={onDragTask}
             />
           ))}
         </div>
@@ -460,6 +505,7 @@ interface Props {
   onDemoToggleTask?: (id: string, completed: boolean) => void;
   onUpdateTaskTitle?: (id: string, title: string) => void;
   onUpdateListName?: (id: string, name: string) => void;
+  onDeleteTaskWithUndo?: (task: Task) => void;
   onDeleteTask?: (id: string) => void;
 }
 
@@ -485,6 +531,7 @@ export function TaskList({
   onDemoToggleTask,
   onUpdateTaskTitle,
   onUpdateListName,
+  onDeleteTaskWithUndo,
   onDeleteTask,
 }: Props) {
   const { t } = useI18n();
@@ -640,6 +687,30 @@ export function TaskList({
     setEditingHeader(false);
   };
 
+  const handleReorderTasks = useCallback((draggedId: string, targetId: string, position: "before" | "after") => {
+    setTasks((prev) => {
+      const draggedIndex = prev.findIndex((t) => t.id === draggedId);
+      const targetIndex = prev.findIndex((t) => t.id === targetId);
+      if (draggedIndex === -1 || targetIndex === -1) return prev;
+
+      const newArr = [...prev];
+      const [draggedItem] = newArr.splice(draggedIndex, 1);
+      const insertAt = position === "before"
+        ? (draggedIndex < targetIndex ? targetIndex - 1 : targetIndex)
+        : (draggedIndex < targetIndex ? targetIndex : targetIndex + 1);
+      newArr.splice(Math.max(0, insertAt), 0, draggedItem);
+      return newArr;
+    });
+  }, [setTasks]);
+
+  const handleDeleteTask = useCallback((task: Task) => {
+    if (onDeleteTaskWithUndo) {
+      onDeleteTaskWithUndo(task);
+    } else if (onDeleteTask) {
+      onDeleteTask(task.id);
+    }
+  }, [onDeleteTaskWithUndo, onDeleteTask]);
+
   if (!listId && !isTrashActive && !selectedTag) {
     return (
       <div style={{ display: "flex", flexDirection: "column", alignItems: "center", justifyContent: "center", height: "100%", color: "var(--text-tertiary)" }}>
@@ -830,6 +901,7 @@ export function TaskList({
             isTrashMode={isTrashActive}
             onRestore={onRestoreTask}
             onPermanentDelete={onPermanentDeleteTask}
+            onDragTask={handleReorderTasks}
           />
         ))}
 
@@ -862,6 +934,7 @@ export function TaskList({
                 isTrashMode={isTrashActive}
                 onRestore={onRestoreTask}
                 onPermanentDelete={onPermanentDeleteTask}
+                onDragTask={handleReorderTasks}
               />
             ))}
           </div>
@@ -897,14 +970,7 @@ export function TaskList({
               label: t("deleteTaskConfirm").split("?")[0],
               icon: "🗑️",
               danger: true,
-              onClick: async () => {
-                if (onDeleteTask) {
-                  onDeleteTask(contextMenu.task.id);
-                } else if (!isDemo) {
-                  await fetch(`/api/tasks/${contextMenu.task.id}`, { method: "DELETE" });
-                  onRefresh();
-                }
-              },
+              onClick: () => handleDeleteTask(contextMenu.task),
             },
           ]}
           onClose={() => setContextMenu(null)}

src/lib/mockData.ts

@@ -334,18 +334,25 @@ export function findTaskInTree(tree: MockTask[], id: string): MockTask | null {
   return null;
 }
 
-// Get all active tasks or all trash tasks flattened
+// Get all active tasks or all trash tasks flattened (strictly deduplicated)
 export function getAllTrashTasks(tree: MockTask[]): MockTask[] {
-  let trash: MockTask[] = [];
-  for (const node of tree) {
+  const map = new Map<string, MockTask>();
+
+  function collect(nodes: MockTask[]) {
+    for (const node of nodes) {
       if (node.isDeleted) {
-      trash.push(node);
+        if (!map.has(node.id)) {
+          map.set(node.id, { ...node, children: [] });
+        }
       }
       if (node.children && node.children.length > 0) {
-      trash = trash.concat(getAllTrashTasks(node.children));
+        collect(node.children);
       }
     }
-  return trash;
+  }
+
+  collect(tree);
+  return Array.from(map.values());
 }
 
 // Filter tasks by custom tag