Regenerate the board art in a Candy-Crush palette via real image
generation (codex imagegen tool), keeping each PNG's exact dims and
source format so no code/layout changes are needed:
- background.png: 863x1822 opaque RGB — bright bubblegum-pink ->
lavender -> sky-blue candy gradient with soft bokeh sparkles
(was the dark purple/indigo/teal gradient).
- cell.png: 128x128 RGBA — light glossy frosted candy tile with a
warm pink/lavender tint, keeping it light so the 6 gems stay legible.
Generated at imagegen-native sizes, then center-cropped (background, to
preserve aspect) and resized with sips to the exact target dims/format.
Refresh the resting-board goldens (p9_polish, p4_board) captured at
M3TE_ANIM_TIME=0 to show the new palette with all 6 gems legible.
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