Fix box resize crossing and keep editing within image bounds

[lucas-fochesatto]

Description

Bounding box edits now cross opposite edges, follow captured pointer movement without freezing, and stop at image boundaries so previews and saved geometry stay consistent.

Type of Change

• Bug fix

Validation

• Tests added or updated where behavior changed
• Documentation updated where the public API or workflow changed
• Screenshots or recording attached for visual changes
• 93 engine/renderer tests; editor integration and undo/redo against the built artifact.
• Core/web/editor typechecks, lint, package build, and 12 clean-consumer smoke tests passed.
• Browser: all image edges, crossing, 50% zoom, creation/movement, undo, and cancellation.

Notes For Reviewers

Browser input constrains boxes to natural media dimensions. Direct engine input can opt in with the optional mediaDimensions field. Roboflow needs a new supervision release before updating its pinned dependency.

[digaobarbosa]

Testing this here:
https://www.loom.com/share/db636c382e354404a82ba5973d81db75