The theme system stores one flat background colour per element, so a rainbow
background can't be expressed as a preset alone. Add a small display hook:
when Pride is selected, displayClearBuf()/displayClearRows() paint the six
pride-flag stripes across the framebuffer instead of a flat fill (gated on a
flag only the Pride preset sets, and behind HAS_COLOURS so mono builds are
untouched). Non-selected menu rows draw text straight over the canvas, while
the title/header/notifications paint solid white boxes, so chrome stays
readable over the stripes; blue/violet are lightened slightly for black-text
contrast. Docs and changelog updated.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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