Undo fixes:
- Move undo now redraws deviceLayer so devices visually snap back
- Label, reference, gauge, color, and all wire/device property changes are now undoable
- Duplicate and paste are now undoable (deletes cloned devices on Ctrl+Z)
Right-click menu additions (roadmap 16-20):
- Align & distribute: left/right/top/bottom edges, H/V spacing for multi-select
- Bring to front / Send to back via zOrder in device.properties
- Copy/paste wire style (color, gauge, stripe, twisted pair, shielded)
- Select all wires on net highlights every wire sharing the same label
- Lock device: prevents moves, shows padlock badge, persists across refresh
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>