- CropOverlay: register move/up handlers dynamically on drag start (single
handler instead of 8x per-handle), remove on drag end. Override destroy()
to call _cleanup() preventing keyboard listener leaks.
- Text format toolbar: re-measure text bounds (w/h) after fontSize/fontFamily
changes, update spatial index and transform box.
- TextEditor: add clearText() method; tools.ts uses it instead of fragile
document.querySelector('textarea').
- SceneManager._updateItem: apply crop mask on remote sync for image items.
- useCanvasSetup: stop TextEditor on unmount to prevent orphaned textarea.
- Double-click zoom: use item.data dimensions instead of getBounds() (which
includes shadow offset).