Fix: add is:inline to support-us script so onclick handlers can reach functions

Astro wraps <script> tags as ES modules; inline onclick="fn()" only reaches
window globals. is:inline emits the script verbatim so all functions are global.

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

src/pages/support-us.astro

@@ -780,7 +780,7 @@ const faqs = [
         <SiteFooter fullBleedOnMobile />
     </div>
 
-    <script>
+    <script is:inline>
         // ── Nav scroll ────────────────────────────────────────────
         const nav = document.getElementById("site-nav");
         if (nav) {