--muted is color-mix()'d toward --base00/--bg — correct for dimmed text
on the page background, wrong for dimmed text sitting on the elevated
--purple-dim fill (badge/dropdown-item backgrounds). Badge's label/caret
used bare --muted there and mara measured it at ~1.3:1 contrast against
her theme's badge fill, essentially invisible.
--muted-on-dim mixes toward --purple-dim instead, same contrast-floor
technique as --muted itself, just anchored to the surface it's actually
used on. Applied to .ui-badge-label/.ui-badge-caret and to Dropdown's
active-item description (same bug: its row bg is --purple-dim too).
Ceiling note: even plain --fg only reaches ~3.4:1 against --purple-dim
in mara's theme, short of formal 4.5:1 AA — that's the theme's own
limit, not something the anchor choice can fix on its own. 90% gets
close to that ceiling (~3:1, more than double the old ~1.3:1) while
keeping a hint of the label/value visual distinction.
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