Styles: adds the scrim and on-art tokens so the black overlays and the
white marks drawn over artwork stop being raw tailwind colours, and
routes every component through the semantic layer instead of reaching
into the --mf-* palette. Renames --mf-accent-60, which was actually an
80% mix, to --mf-accent-soft, and removes the unused --mf-radius and
the --color-neutral-950 override.
Dead code: the root +layout.server.ts already redirects everything
except /login, so the anonymous branches in the home and explore loads
and the needsAuth empty state could never run. Deletes the unused
accentSoft helper, and stops exporting helpers nobody imports.
fmtTime and fmtDate move out of theme/color.ts into $lib/format.ts;
they are not colour concerns.
The accent animation now cancels its pending frame on teardown.
Updates the compose build context, the Dockerfile header, the package
name and the docs. The compose service and container keep the name
frontend/musify-frontend, since nginx routes to http://frontend:3000.
The source files also carry the first prettier pass, so the rename and
the reformat land together for them.
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