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/photos/page.tsx

@@ -1,3 +1,4 @@
+import { ContentCard, EmptyState } from "@/components/public/ui";
 import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
@@ -29,41 +30,43 @@ export default async function PhotosPage() {
   }
 
   return (
-    <main>
-      <div className="hero">
-        <h1>Photos</h1>
-        <p className="muted" style={{ marginTop: 0 }}>
-          The latest snapshots taken in the hotel.
-        </p>
-      </div>
+    <main style={{ display: "grid", gap: "1.5rem" }}>
+      <ContentCard
+        icon="📸"
+        title="Photos"
+        subtitle="The latest snapshots taken in the hotel"
+      />
 
-      {photos.length === 0 ? (
-        <p className="muted">No photos yet.</p>
-      ) : (
-        <div className="grid cols-3">
-          {photos.map((p) => (
-            <article key={String(p.id)} className="card">
-              {/* eslint-disable-next-line @next/next/no-img-element */}
-              <img
-                src={p.url}
-                alt={`Photo by user #${p.userId}`}
-                style={{
-                  width: "100%",
-                  height: "auto",
-                  borderRadius: 4,
-                  display: "block",
-                }}
-              />
-              <p className="muted" style={{ margin: "0.5rem 0 0" }}>
-                {formatDate(p.timestamp)}
-              </p>
-              <p className="muted" style={{ margin: 0 }}>
-                by user #{p.userId}
-              </p>
-            </article>
-          ))}
-        </div>
-      )}
+      <ContentCard padded={photos.length === 0}>
+        {photos.length === 0 ? (
+          <EmptyState icon="📸">No photos yet.</EmptyState>
+        ) : (
+          <div className="card-grid sm-2 md-3 lg-4" style={{ padding: "1rem" }}>
+            {photos.map((p) => (
+              <article key={String(p.id)} className="card hover" style={{ padding: 0, overflow: "hidden" }}>
+                {/* eslint-disable-next-line @next/next/no-img-element */}
+                <img
+                  src={p.url}
+                  alt={`Photo by user #${p.userId}`}
+                  style={{
+                    width: "100%",
+                    height: "auto",
+                    display: "block",
+                  }}
+                />
+                <div style={{ padding: "0.7rem 0.85rem" }}>
+                  <p className="muted" style={{ margin: 0, fontSize: "0.85rem" }}>
+                    {formatDate(p.timestamp)}
+                  </p>
+                  <p className="muted" style={{ margin: 0, fontSize: "0.85rem" }}>
+                    by user #{p.userId}
+                  </p>
+                </div>
+              </article>
+            ))}
+          </div>
+        )}
+      </ContentCard>
     </main>
   );
 }