- add tokens/ColorTokens.h (Slate/Blue/Red/Green scales, semantic roles,
shared SearchTint ramp) and reference it from painted widgets
- dark: media-action-menu and modern-tray-menu moved from Gray/Zinc to Slate
- light: full Gray->Slate sweep, one-off tinted blues collapsed to
Blue-50/Blue-100/Slate-50, Windows-blue links mapped to Blue-600/700
- radii off-scale values (10px/16px) converged to the 8/14 scale,
font sizes 9/15/22/26px converged to the documented scale
- dark white overlays collapsed from 40+ alpha stops to a 6-step scale
(player OSD keeps a separate high-alpha band, now decimal notation)
- librarycard/collectioncard palettes now read from ColorTokens (no visual change)
- searchhistorychip/searchcompleterpopup private blue palettes replaced by
the shared SearchTint ramp so both render identical heat levels
- removed dead #playerControlBar/#playPauseBtn and webdav-visibility-toggle
rules; close-button red unified on #DC2626/#EF4444
- palette header comments in both QSS files updated as the reference
dela