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):**