feat(home/oyez): link the Oyez! banner to oyez.ariege.io

Wrap the banner image in an external link to oyez.ariege.io (new tab),
with a subtle hover fade.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/views/HomeView.vue

@@ -208,11 +208,18 @@ const featuredEvents = [
         <p class="font-display text-xs uppercase tracking-[0.3em] text-accent">
           {{ t('home.oyez.kicker') }}
         </p>
+        <a
+          href="https://oyez.ariege.io"
+          target="_blank"
+          rel="noopener"
+          class="mt-4 block transition hover:opacity-90"
+        >
           <img
             :src="oyezBanner"
             :alt="t('home.oyez.title')"
-          class="mx-auto mt-4 w-5/6 max-w-md md:w-full"
+            class="mx-auto w-5/6 max-w-md md:w-full"
           />
+        </a>
         <p class="mt-6 text-xs uppercase tracking-[0.2em] text-foreground/80">
           {{ t('home.oyez.subtitle') }}
         </p>