docs: Write canvas and view controls guide #13
Description
Summary
Document canvas controls, zoom, pan, and view management in Rackula.
Content Outline
Zoom Controls
- Zoom in/out with toolbar buttons
- Zoom range: 50% - 200% (25% steps)
- Reset zoom to 100%
- Keyboard shortcuts (Ctrl +/-)
Fit to View
- Fit all button (F key)
- Auto-zoom to show entire rack
- Zoom to device feature
Pan & Navigation
- Pan canvas with mouse drag
- Scroll to pan
- Canvas boundaries
View Modes
- Front view
- Rear view
- Toggle between views
- Device visibility per view
Multiple Racks
- Switching between racks
- Rack tabs navigation
- Rack arrangement
Acceptance Criteria
- All zoom controls documented
- Pan behaviour explained
- View switching documented
- Screenshots for each control
Test Requirements
- Build completes without errors