Add, additively (no component migration yet), the tokens from
section B.1 of the refactor plan: radii (tag/thumb), cover and icon
sizes, container widths, typographic tracking/leading, button colors
(--color-btn*), typography @utility recipes (text-display-*,
text-eyebrow, text-body, text-count), icon stroke
(stroke-thin/regular/bold), surfaces/grids (glass-bar, grid-cards*,
theme-transition), and the .animate-enter stagger via --i. Add
layout variables (--mf-player-side-w, --mf-menu-w, --mf-submenu-w,
--mf-range-*) and semantic z-index in theme.css. Clean up unused
color utilities (--color-accent-dim/glow/hair/line/muted,
--color-on-accent) and remove --mf-sidebar-bg (no importers) from
theme.css and tokens.ts. Scrollbar moves to tokens with a light-mode
variant.
Verified with npm run build (Tailwind compiles the @utility recipes
with responsive variants inside @apply).
Fix eslint (dead imports in liked), missing title size in MediaCard,
non-exclusive classes in the Home spotlight rows, typography in the
album delete modal, useless text-base on icon buttons (Sidebar,
Queue), and remove Badge.svelte (unused).
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