feat(theme): R10 S1 — semantic status colors (danger/warn/success)

Add theme-scoped --danger/--warn/--success (+ -fg) tokens wired into the v4
@theme inline, replacing ~110 raw red/amber/emerald/green palette refs across
34 files. Fixes light-theme contrast failures (fixed Tailwind shades fell to
~1.7-3:1 on white). Status colors are scheme-independent — recognised by hue,
shifting only by theme to hold contrast (bright on dark bg, darkened on light).
Solid fills use the paired -fg text; @source inline guarantees the full -fg set
exists. IMDb rating gold kept as a deliberate decorative non-status exception.

frontend/src/components/playlistColumns.tsx

@@ -106,7 +106,7 @@ export function playlistColumns({
           <span
             className={`text-[10px] font-semibold uppercase tracking-wide px-1.5 py-0.5 rounded ${
               v.live_status === "live"
-                ? "bg-red-500/90 text-white"
+                ? "bg-danger/90 text-danger-fg"
                 : "bg-card border border-border text-muted"
             }`}
           >