feat: Themes added, 4 themes available (3 dark, 1 light)

frontend/src/components/ContestPanel.tsx

@@ -85,9 +85,9 @@ export function ContestPanel({ session, onChange }: {
       {/* Setup card. */}
       <div className="rounded-xl border border-border bg-card shadow-sm overflow-hidden">
         <div className="flex items-center gap-2 px-4 py-2.5 border-b border-border/60 bg-muted/30">
-          <Trophy className="size-4 text-amber-500" />
+          <Trophy className="size-4 text-warning" />
           <span className="text-xs font-bold uppercase tracking-wider text-foreground/80">{t('ctp.contestSetup')}</span>
-          {session.active && <span className="ml-auto rounded bg-amber-500 px-2 py-0.5 text-[10px] font-black uppercase tracking-wider text-white">{t('ctp.live')}</span>}
+          {session.active && <span className="ml-auto rounded bg-warning px-2 py-0.5 text-[10px] font-black uppercase tracking-wider text-warning-foreground">{t('ctp.live')}</span>}
         </div>
         <div className="p-4 space-y-3">
           <div className="flex flex-wrap items-center gap-2">
@@ -150,13 +150,13 @@ export function ContestPanel({ session, onChange }: {
           <div className="flex items-center gap-2 pt-1">
             {session.active ? (
               <button type="button" onClick={() => onChange({ active: false })}
-                className="rounded-md border border-rose-500/60 bg-rose-500/10 px-4 py-1.5 text-sm font-bold text-rose-600 hover:bg-rose-500/20">
+                className="rounded-md border border-danger/60 bg-danger/10 px-4 py-1.5 text-sm font-bold text-danger hover:bg-danger/20">
                 {t('ctp.stopContest')}
               </button>
             ) : (
               <button type="button" disabled={!session.code}
                 onClick={() => onChange({ active: true, startISO: session.startISO || new Date().toISOString() })}
-                className="rounded-md bg-amber-500 px-4 py-1.5 text-sm font-bold text-white hover:bg-amber-600 disabled:opacity-40">
+                className="rounded-md bg-warning px-4 py-1.5 text-sm font-bold text-warning-foreground hover:bg-warning disabled:opacity-40">
                 {t('ctp.startContest')}
               </button>
             )}