* feat(canvas): measure distances between layers
- Show temporary Figma-style guides while Option or Alt is held
- Support deep nested targets with Command or Control plus Alt
- Measure transformed world bounds and container padding
* fix(canvas): anchor diagonal measurement guides
- Join diagonal distances at the nearest object corners
- Separate horizontal and vertical value badges
- Crop visual coverage tightly around the measurement overlay
* fix(canvas): cover measurement edge cases
- Draw transformed target outlines and center value pills on guides
- Suppress conflicting hover overlays during measurement mode
- Cover containment, overlap, multi-selection, rotation, and fractional gaps
* fix(canvas): suppress conflicting measurement overlays
- Hide auto-layout hover visuals while distance measurements render
- Assert fractional measurement geometry with numeric tolerance
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