ESC or Click to exit preview
Mouse: (-, -) Zoom: 100%
Wheel: Zoom | Right-drag: Pan | Left-drag: Draw/Resize
Shift+Resize: Keep ratio | Ctrl+Z: Undo
Click rect edge/corner: Resize | Click rect inside: Move
Preview: Full confirm view (ESC or click to exit)
-- Load image and drag to draw clickable areas