Wheel / trackpad pinch zooms toward the cursor (up to 8x), drag pans when
zoomed, and two-finger pinch works on phones. A drag never toggles
playback. A badge shows the zoom level with -/+/Fit while zoomed, and
+ / - / 0 work from the keyboard. Zoom resets when the video changes.
Video, blanking and the annotation canvas zoom as one layer, so marks
drawn while zoomed land where the pointer is and stay pinned to the image.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>