refboard: complete image geometry rework — consumer adoption + tests
- Fix grouping.ts ungroup: transform display position (with flip
compensation) through group transform, then back-calculate canonical
data.x/y. Fixes visual jump for flipped images in rotated groups.
- Fix clipboard.ts + export.ts resolution estimation: account for
scale when computing effective rendered width for texture ratio.
- Add imageTransforms.test.ts: 32 unit tests covering source rect,
visible local rect, display transform, display geometry, editor
geometry anchor preservation, crop rect round-trips, coordinate
conversions, negative scale normalization, and world bounds invariants.
- Add vitest as dev dependency with "test" script.
- Include canonical geometry layer (imageTransforms.ts) and crop
session rewrite (CropOverlay.ts) from prior work.
- Add image geometry rework plan document.
Hiren Kangad
9a4edd90c7