Minimap:
- Auto-shows in bottom-right corner when zoom > 1.05
- Renders full board content at scale (background + all strokes)
- Purple viewport indicator with darkened outer areas
- Click/drag to jump-pan the viewport
- Cleaned up on destroy()
Ruler/protractor property controls:
- Rotation handle (purple ↺) — drag to rotate around origin
- Resize handle (cyan ↔) — drag to change length/radius
- Protractor now supports rotation via ctx.rotate(ov.angle)
- Floating props panel in toolbar: angle° and length/radius inputs
- Panel auto-shows on first click/drag, hides when overlay toggled off
- Canvas-space hit testing with rotation-aware local coordinates
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Maxim Dolgolyov
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