Translucent color-mix background + backdrop-filter blur/saturate,
same recipe as the header chrome/terminal glass (chrome.css,
terminal.css). Dark (mocha) palette only: applies the glass look to
the default filled badges, keeps light (latte) mode's plain solid
fill unchanged since a bright/busy background behind a badge would
lose legibility from the same transparency that helps on a dark
background. variant="quiet" badges are untouched (they already have
no permanent fill to frost).
Verified with a synthetic striped-background test page (raw CSS
against colors.css/theme.css/Badge.css, not the bundled app) to make
the blur/transparency visually obvious, plus real headless-chromium
screenshots of the built agent + swarm-ui dist to confirm no
regression against real content — the effect is real but subtle
there since the chrome background is flat, which is expected.
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