Replace ~92 hardcoded Catppuccin rgba literals across the dashboard,
agent, and shared terminal stylesheets with color-mix() over the theme
:root vars, so a stylix-generated theme.css recolours the whole UI, not
just the elements that already referenced the vars. Pixel-identical
under the default palette (same RGB + alpha; color-mix(in srgb, C N%,
transparent) == rgba(C, N/100)).
Also fixes four var(--mauve, #cba6f7) usages: --mauve is undefined (the
var is --purple), so they were silently falling back to the hardcoded
hex and would not have recoloured on a theme swap. The bare crust hex in
terminal.css and the checkerboard-gradient hexes in common.css are
var-derived too.
Pure black/white drop-shadow/frost scrims are left as literals (not
theme colours). Two off-palette surface tints (dim-purple schedule rows,
warm-amber inline-button hover) are also left, with a comment, pending a
dedicated named var. Correct-var fallbacks like var(--red, #f38ba8) are
left as-is since they already recolour via the var.
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