Tanish Manku 75101ddce2 8-bit documents: soft, low-flow brush strokes are dithered instead of banded (#3237) ...

Brush phase 6c. A stroke composites in float, then each pixel is rounded to 8 bits, so a soft,
low-flow stroke's gentle gradient collapses into flat bands (the audit counted 35 levels against
119 at 16-bit). The pixels the stroke changes now get the same deterministic per-pixel offset of
under half a level on every channel before quantisation:
- fractional values round up or down in proportion, so bands become fine grain;
- a value already on an 8-bit level rounds back to itself, so exact colours never change, and
  pixels the stroke doesn't touch are left alone;
- the offset depends only on the pixel's position, so the live preview, the commit and a replay
  agree.
16-bit and float targets are unchanged.

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..

examples

Format: adopt the craft-family rustfmt.toml and format the workspace

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src

8-bit documents: soft, low-flow brush strokes are dithered instead of banded (#3237)

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Cargo.toml

more algorithms, progress

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