martin brook 2cc497cdca fix: use double FAST_REFRESH to prevent washout on large grey images (#957) ...

## Summary

Fixes https://github.com/crosspoint-reader/crosspoint-reader/issues/1011

Use double FAST_REFRESH for image pages to prevent grayscale washout,
HALF_REFRESH sets e-ink particles too firmly for the grayscale LUT to
adjust, causing washed-out images (especially large, light-gray ones).
Replace HALF_REFRESH with @pablohc's double FAST_REFRESH technique:
blank only the image bounding box area, then re-render with images. This
clears ghosting while keeping particles loosely set for grayscale.

## Additional Context

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### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**<  PARTIALLY  >**_

2026-02-20 16:39:17 +11:00

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