Add mask refinement with edge cleanup and undoable output - #138
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Select → Refine Mask opens a workspace for improving an active selection or existing layer mask. It offers image-guided edge refinement, smoothing, edge expansion/contraction, feathering, color halo removal, contrast backgrounds, and an original-mask comparison.
Apply writes a nondestructive mask in one undoable edit. Color halo removal instead creates a corrected raster copy and preserves the original. Full-resolution work uses overlapping bounded blocks, supports cancellation, and rejects stale results. This PR also counts retained masks and layer/source snapshots toward the undo memory budget.
Validation:
make check-mask-refinement: 14 refinement regressions plus two undo-memory regressions, followed by the editor check.make lint-app,make check-i18n, andmake check-app-webon this standalone branch.Color halo removal supports RGB rasters; native CMYK/Lab layers support mask-only refinement. Preview sampling and memory bounds are described in
docs/mask-refinement.md. The new catalog is translated in all 149 non-English locales, including generated aliases.Translations were authored and separately reviewed by GPT-5.6 Sol agents. The locale audit includes short labels, preserved placeholders and numeric limits, and channel direction.
make check-i18nvalidates the updated standalone branch, including font coverage and locale aliases.