Antigravity 21fb56de3f feat(sidebar): drag-and-drop notebook reordering ...

- Add GripVertical handle (visible on hover) as reorder affordance
- Rows are now draggable; uses 'application/x-notebook' dataTransfer type
  to coexist with existing note-to-notebook drag ('text/plain')
- Drop indicator: thin primary-colored line above the insertion target
- Dragged item fades to 40% opacity during drag
- On drop: calls updateNotebookOrderOptimistic → POST /api/notebooks/reorder → persisted in DB
- draggingNbRef (useRef) used for stale-closure-safe detection in dragover handler

2026-05-03 21:06:34 +00:00

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