feat(home): 'Top Zapped' section linking to the leaderboard

Shows the four most-zapped spots (last 30 days) on the home page, with their
sats totals, linking through to /leaderboards. Renders nothing when there is
no zap activity or no linkable spot, so the section never appears empty.

src/pages/Index.tsx

@@ -1,3 +1,4 @@
+import { useMemo } from 'react';
 import { useSeoMeta } from '@unhead/react';
 import { Link } from 'react-router-dom';
 import { Layout } from '@/components/Layout';
@@ -9,6 +10,8 @@ import { LoginArea } from '@/components/auth/LoginArea';
 import { useSkateSpots } from '@/hooks/useSkateSpots';
 import { useUpcomingSkateEvents } from '@/hooks/useSkateEvents';
 import { useLabProfiles } from '@/hooks/useLabProfiles';
+import { useZapLeaderboard } from '@/hooks/useZapLeaderboard';
+import { SKATE_SPOT_KIND, type SkateSpot } from '@/lib/types';
 import { useCurrentUser } from '@/hooks/useCurrentUser';
 import { useAuthor } from '@/hooks/useAuthor';
 import { useTranslation } from '@/contexts/LanguageContext';
@@ -25,6 +28,7 @@ import {
   GraduationCap,
   Video,
   Crown,
+  Zap,
 } from 'lucide-react';
 import { FounderFollow } from '@/components/FounderFollow';
 import { SponsorSlot } from '@/components/SponsorSlot';
@@ -238,6 +242,84 @@ function UpcomingEvents() {
   );
 }
 
+function TopZappedSection() {
+  // Last 30 days of zap activity, aggregated once.
+  const since = useMemo(() => Math.floor(Date.now() / 1000) - 30 * 24 * 60 * 60, []);
+  const { data } = useZapLeaderboard(since);
+  const { data: spots } = useSkateSpots(200);
+
+  const spotByCoord = useMemo(() => {
+    const map = new Map<string, SkateSpot>();
+    for (const s of spots ?? []) {
+      map.set(`${SKATE_SPOT_KIND}:${s.pubkey}:${s.identifier}`, s);
+    }
+    return map;
+  }, [spots]);
+
+  // Only spots we can actually link to, so every row lands somewhere real.
+  const top = useMemo(
+    () =>
+      (data?.targets ?? [])
+        .filter((t) => t.key.startsWith(`${SKATE_SPOT_KIND}:`) && spotByCoord.has(t.key))
+        .slice(0, 4),
+    [data, spotByCoord],
+  );
+
+  // Never render an empty section on the home page.
+  if (top.length === 0) return null;
+
+  return (
+    <section className="bg-black py-16 border-t border-[#ccff00]/30">
+      <div className="container px-4">
+        <div className="flex items-center justify-between mb-8">
+          <div>
+            <h2 className="font-display text-4xl md:text-5xl neon-lime mb-1 tracking-wide">
+              TOP ZAPPED
+            </h2>
+            <p className="font-condensed text-gray-400 uppercase text-sm tracking-[0.15em]" style={{ fontWeight: 600 }}>
+              Most supported spots this month
+            </p>
+          </div>
+          <Link to="/leaderboards">
+            <Button variant="ghost" className="gap-2 text-[#ccff00] hover:text-[#ccff00]/80 hover:bg-[#ccff00]/10">
+              Leaderboard
+              <ChevronRight className="h-4 w-4" />
+            </Button>
+          </Link>
+        </div>
+
+        <div className="space-y-2">
+          {top.map((t, i) => {
+            const spot = spotByCoord.get(t.key)!;
+            const isShop = spot.types.includes('shop');
+            return (
+              <Link
+                key={t.key}
+                to={isShop ? `/shop/${spot.pubkey}/${spot.identifier}` : `/spot/${spot.pubkey}/${spot.identifier}`}
+                className="block"
+              >
+                <div className="flex items-center gap-3 rounded-xl border-2 border-white/10 bg-black/60 px-3 py-2.5 transition-colors hover:border-[#ccff00]/60">
+                  <span className="flex w-6 items-center justify-center text-sm font-bold text-gray-500">
+                    {i === 0 ? <Crown className="h-5 w-5 text-yellow-400" /> : `#${i + 1}`}
+                  </span>
+                  <div className="min-w-0 flex-1">
+                    <p className="truncate font-bold uppercase tracking-wide text-white">{spot.title}</p>
+                    {spot.location && <p className="truncate text-xs text-gray-500">{spot.location}</p>}
+                  </div>
+                  <div className="flex items-center gap-1 font-bold text-[#ccff00]">
+                    <Zap className="h-4 w-4" />
+                    {t.sats.toLocaleString()}
+                  </div>
+                </div>
+              </Link>
+            );
+          })}
+        </div>
+      </div>
+    </section>
+  );
+}
+
 function TheLabSection() {
   const { data: profiles, isLoading } = useLabProfiles(100);
   const { t } = useTranslation();
@@ -552,6 +634,7 @@ export default function Index() {
     <Layout>
       <HeroSection />
       <FeaturedSpots />
+      <TopZappedSection />
       <UpcomingEvents />
       <TheLabSection />
       <NewToNostrSection />