Per feedback, the solid color-mix bar was wrong — sidebar, queue and
the mobile header should stay on the plain --mf-bg (the same subtly
hue-shifting black used everywhere else), exactly like light mode
already does, not a separately-boosted colored panel. Drop --mf-chrome-bg/
--color-chrome and switch those three back to bg-bg.
The general dark-mode richness bump (tc(), --mf-bg/--mf-elevated/etc.)
and the glass-bar background-color fix from the previous commit stay;
only the separate chrome treatment is reverted.
Mirror the earlier light-mode pastel/colorful pass for dark mode:
boost tc()'s lightness and chroma, and richen --mf-bg/--mf-elevated/
--mf-panel-bg/--mf-bar-bg/--mf-hairline the same way, so dark mode
reads as colorful instead of near-grayscale.
Sidebar, Queue, and MobileHeader used bg-bg directly, so in dark mode
they stayed almost black regardless of hue. Add --mf-chrome-bg (an
alias to --mf-bg in light mode, a solid color-mix of --mf-hero-tint
into --mf-bg in dark mode) and switch those three to bg-chrome, so
they read as a full, solid colored bar in dark mode instead of a
fading gradient (per feedback: a whole bar, not a gradient).
Also fixes glass-bar (PlayerBar/TabsBar): it set
`background-image: var(--mf-bar-bg)`, but --mf-bar-bg is a plain
color, not a valid <image>, so the declaration was silently dropped
and these bars never actually showed their tint in either mode. Changed
to background-color.
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