v0.3.49

feat(ui): left-drag to pan the METEOR image preview

Hold the left mouse button on the image and drag to move it inside the
scroll-area viewport (the "hand tool"), adjusting the scrollbars by the
cursor delta tracked in global coordinates. Pairs with the existing
mouse-wheel zoom: zoom in, then drag to any part of the image. Right-click
still opens the context menu; cursor shows open/closed-hand affordance.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>