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/guilds/page.tsx

@@ -1,4 +1,5 @@
 import Link from "next/link";
+import { ContentCard, EmptyState } from "@/components/public/ui";
 import { excerpt } from "@/lib/format";
 import { prisma } from "@/lib/prisma";
 
@@ -28,45 +29,54 @@ export default async function GuildsPage() {
   const guilds = await getGuilds();
 
   return (
-    <main>
-      <h1>Guilds</h1>
-      {guilds.length === 0 ? (
-        <p className="muted">No guilds yet.</p>
-      ) : (
-        <div className="grid cols-3">
-          {guilds.map((g) => (
-            <Link
-              key={g.id}
-              href={`/guilds/${g.id}`}
-              className="card hover"
-              style={{
-                display: "flex",
-                gap: "0.85rem",
-                alignItems: "flex-start",
-                color: "inherit",
-                textDecoration: "none",
-              }}
-            >
-              {g.badge ? (
-                // eslint-disable-next-line @next/next/no-img-element
-                <img
-                  src={`https://habbo-stories-content.s3.amazonaws.com/badge-part-images/${g.badge}.gif`}
-                  alt={`${g.name} badge`}
-                  width={40}
-                  height={40}
-                  style={{ flex: "0 0 auto" }}
-                />
-              ) : null}
-              <div style={{ minWidth: 0 }}>
-                <h3 style={{ margin: "0 0 0.25rem" }}>{g.name || "Unnamed guild"}</h3>
-                <p className="muted" style={{ margin: 0 }}>
-                  {g.description ? excerpt(g.description, 120) : "No description"}
-                </p>
-              </div>
-            </Link>
-          ))}
-        </div>
-      )}
+    <main style={{ display: "grid", gap: "1.5rem" }}>
+      <ContentCard
+        icon="🚪"
+        title="Guilds"
+        subtitle="Browse the groups players have created and joined"
+      />
+
+      <ContentCard padded={guilds.length === 0}>
+        {guilds.length === 0 ? (
+          <EmptyState icon="🚪">No guilds yet.</EmptyState>
+        ) : (
+          <div className="card-grid sm-2 lg-3" style={{ padding: "1rem" }}>
+            {guilds.map((g) => (
+              <Link
+                key={g.id}
+                href={`/guilds/${g.id}`}
+                className="card hover"
+                style={{
+                  display: "flex",
+                  gap: "0.85rem",
+                  alignItems: "flex-start",
+                  color: "inherit",
+                  textDecoration: "none",
+                }}
+              >
+                {g.badge ? (
+                  // eslint-disable-next-line @next/next/no-img-element
+                  <img
+                    src={`https://habbo-stories-content.s3.amazonaws.com/badge-part-images/${g.badge}.gif`}
+                    alt={`${g.name} badge`}
+                    width={40}
+                    height={40}
+                    style={{ flex: "0 0 auto" }}
+                  />
+                ) : null}
+                <div style={{ minWidth: 0 }}>
+                  <h3 style={{ margin: "0 0 0.25rem", fontSize: "1rem" }}>
+                    {g.name || "Unnamed guild"}
+                  </h3>
+                  <p className="muted" style={{ margin: 0 }}>
+                    {g.description ? excerpt(g.description, 120) : "No description"}
+                  </p>
+                </div>
+              </Link>
+            ))}
+          </div>
+        )}
+      </ContentCard>
     </main>
   );
 }