- Add Extend/Mirror toggle to Native OS config section (always visible,
no Technical Mode required). Default: Extend. State updates on success.
- Replace .catch(() => {}) swallowing with console.warn logging on both
set_display_layout call sites so failures appear in the Electron console
- Remove old edit-mode-only Extend button (replaced by new toggle)
- Update PROJECT doc: displayplacer install note, binary lookup order, GitHub link
- Clean up TODO__Agents.md: resolve stale items, add new low-priority Electron items
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>