feat: filter homepage sponsors to last 12 months

Only display sponsors who sponsored an event in the last 12 months
instead of showing all sponsors ever. Uses schedule data as source
of truth.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Slashgear

app/page.tsx

@@ -1,4 +1,4 @@
-import * as sponsors from '../data/sponsors';
+import { getRecentSponsors } from '../data/schedule';
 import * as partners from '../data/partners';
 import React from 'react';
 import { HomeHero } from '../modules/home/HomeHero';
@@ -12,6 +12,7 @@ import { HomeAnnouncement } from '../modules/lyonjs100/HomeAnnouncement';
 export const revalidate = 3600;
 
 export default function Home() {
+  const sponsors = getRecentSponsors();
   return (
     <main>
       <HomeHero />

data/schedule.ts

@@ -109,3 +109,19 @@ export const schedule: Schedule[] = [
     date: '06/10/2026',
   },
 ];
+
+export function getRecentSponsors(months = 12): Record<string, Sponsor> {
+  const now = new Date();
+  const cutoff = new Date(now.getFullYear(), now.getMonth() - months, now.getDate());
+
+  const result: Record<string, Sponsor> = {};
+  for (const entry of schedule) {
+    if (!entry.sponsor?.logo) continue;
+    const [month, day, year] = entry.date.split('/');
+    const date = new Date(Number(year), Number(month) - 1, Number(day));
+    if (date >= cutoff && date <= now) {
+      result[entry.sponsor.name] = entry.sponsor;
+    }
+  }
+  return result;
+}