Retune the GPU clear colour on both render paths (Metal on iOS, GL on
desktop) from the old dark navy (0.05,0.06,0.10) to a candy-lavender tone
sampled from the regenerated background's mid-gradient. The dark navy was
the one off-palette constant left after P12.1/P12.2; the background art
covers the full drawable in steady state, so it only ever surfaced as a
pre-load flash / potential dark seam. A single shared CLEAR_R/G/B keeps the
two paths from diverging.
Refresh the stale full-board goldens (p4_board, p9_polish), which still
showed the pre-P12.2 dark HUD, to the current cohesive candy palette.
5e78d25d8b
