feat: add sponsors section with transparent logos

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

src/app/page.tsx

@@ -760,6 +760,42 @@ export default function HomePage() {
 
         <TrustSection />
 
+        {/* ─── PATROCINADORS ────────────────────────────────────── */}
+        <section className="max-w-6xl mx-auto px-4 sm:px-6 py-12 border-t border-dark-border">
+          <p className="text-xs text-slate-500 uppercase tracking-widest text-center mb-10">Amb el suport de</p>
+          <div className="flex flex-col items-center gap-10">
+            <div className="flex flex-col items-center gap-2">
+              <span className="text-[10px] text-slate-600 uppercase tracking-widest">Patrocinador principal</span>
+              <Image
+                src="/assets/finques-prats.png"
+                alt="Finques Prats"
+                width={220}
+                height={110}
+                className="object-contain"
+              />
+            </div>
+            <div className="flex flex-col items-center gap-4">
+              <span className="text-[10px] text-slate-600 uppercase tracking-widest">Col·laboradors</span>
+              <div className="flex flex-wrap justify-center items-center gap-10">
+                <Image
+                  src="/assets/runners-corbins.png"
+                  alt="Corbins Runners"
+                  width={160}
+                  height={90}
+                  className="object-contain"
+                />
+                <Image
+                  src="/assets/ajuntament-de-corbins.png"
+                  alt="Ajuntament de Corbins"
+                  width={110}
+                  height={110}
+                  className="object-contain brightness-90"
+                />
+              </div>
+            </div>
+          </div>
+        </section>
+
         {/* CTA if nothing selected yet */}
         {!selectedProduct && (
           <div className="text-center py-8 pb-16">