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/ProfileEditor.tsx

@@ -136,7 +136,7 @@ export default function ProfileEditor({ onClose }: { onClose: () => void }) {
             <button
               onClick={() => onDelete(p)}
               title={t("downloads.profiles.delete")}
-              className="p-1 rounded-sm hover:bg-surface text-muted hover:text-red-400"
+              className="p-1 rounded-sm hover:bg-surface text-muted hover:text-danger"
             >
               <Trash2 className="w-3.5 h-3.5" />
             </button>