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/AuditLog.tsx

@@ -75,7 +75,7 @@ export default function AuditLog() {
                 <button
                   onClick={onClear}
                   disabled={clear.isPending}
-                  className="inline-flex items-center gap-1.5 text-xs px-2.5 py-1.5 rounded-lg border border-border text-muted hover:text-red-400 disabled:opacity-50 transition"
+                  className="inline-flex items-center gap-1.5 text-xs px-2.5 py-1.5 rounded-lg border border-border text-muted hover:text-danger disabled:opacity-50 transition"
                 >
                   <Trash2 className="w-3.5 h-3.5" />
                   {t("audit.clear")}