Summary

Feature that adds a higher level of resampling for Transform operation.
Added Bilinear, Bicubic, Hamming and Lanczos smoothing algorithms.
New options provide a smoother, less jagged images when layer is resized up or down.

This feature is integrated in currently used transform menu with toggle switch to enable/disable smoothing.
Options can be selected from dropdown menu:

Images for comparison:
Shrinking the image (The biggest benefit)

Also provides smoother results when upscaling the image.

Related Issues / Discussions

Closes:
#8004

QA Instructions

• Open canvas, add a raster layer with visible edges (e.g., a sharp-edged shape or text).
• Enter transform mode, scale up/down with smoothing OFF; apply transform; confirm edges look aliased/nearest-like.
• Enable smoothing toggle; pick each mode (bilinear, bicubic, hamming, lanczos), apply transform, and visually compare edge softness and ringing—expect subtle differences, with lanczos typically sharpest and bilinear softest.
• Toggle smoothing OFF after it was ON; confirm it returns to baseline behavior.
• Verify the smoothing mode selector is disabled when smoothing is OFF and preserves last selection when re-enabled.
• Try both upscale and downscale; confirm smoothing affects both.

Merge Plan

• Low conflict risk overall, but CanvasEntityTransformer.ts and util.ts are active files—worth rebasing/merging latest main right before merge to avoid drift.
• No backend changes needed; the img_resize invocation already supports resample_mode, so the frontend change is sufficient.
• Only en.json updated; if your process expects other locales, note that this is normal for UI-only strings but translation updates may come later.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)