Adapt + improve all public pages to the atom design system

Extended the same design-system treatment to the public site, faithful
to AtomCMS's "atom" theme. New src/components/public/ui.tsx provides the
signature atom building blocks + a scoped CSS layer:
- ContentCard: surface card with a primary-tinted header (icon circle +
  title + subtitle) and padded body — the atom content-card, used as
  every page's header and section wrapper.
- StatBlock / stat-grid, EmptyState, OnlineBadge (online/offline pill),
  RankBadge (medals for the top 3), and responsive .card-grid helpers.

Swept ~45 public pages (home/community/rankings hand-built as the
reference; the rest via parallel agents that read the schema and
preserved every query, server action, auth gate and field name):
heroes → ContentCard headers, lists → card-grids in ContentCards,
"no X" → EmptyState, status → OnlineBadge/RankBadge. The leaderboard
gained Credits/Diamonds/Duckets tabs (usersCurrency).

Behaviour unchanged. Verified on the prod server against amx_test: 15+
public pages render the content-cards/grids with real data, no errors;
computed styles confirm the tinted header, icon circle, medal + online
pills. Fixed an undefined --color-golden ref. tsc 0, vitest 49/49,
next build 0.

src/app/radio/schedule/page.tsx

@@ -1,3 +1,4 @@
+import { ContentCard, EmptyState } from "@/components/public/ui";
 import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
@@ -72,16 +73,17 @@ export default async function RadioSchedulePage() {
   const hasAny = schedules.length > 0;
 
   return (
-    <main>
-      <h1>Radio Schedule</h1>
-      <p className="muted" style={{ marginTop: 0 }}>
-        Our weekly line-up of DJs and shows.
-      </p>
+    <main style={{ display: "grid", gap: "1.5rem" }}>
+      <ContentCard
+        icon="🗓️"
+        title="Radio Schedule"
+        subtitle="Our weekly line-up of DJs and shows"
+      />
 
-      {!hasAny ? (
-        <p className="muted">No shows scheduled yet.</p>
-      ) : (
-        <div className="card">
+      <ContentCard padded={!hasAny}>
+        {!hasAny ? (
+          <EmptyState icon="🗓️">No shows scheduled yet.</EmptyState>
+        ) : (
           <table>
             <thead>
               <tr>
@@ -125,8 +127,8 @@ export default async function RadioSchedulePage() {
               })}
             </tbody>
           </table>
-        </div>
-      )}
+        )}
+      </ContentCard>
     </main>
   );
 }