style(frontend): apply ultracite 7.12 formatting and lint rules

frontend/src/lib/components/ActionMessage.svelte

@@ -34,7 +34,7 @@
   const actor = $derived(nameOf(message.sender_id));
 
   const text = $derived.by(() => {
-    const service = message.service;
+    const { service } = message;
     if (!service) {
       return "";
     }
@@ -85,14 +85,15 @@
 <div class="ActionMessage">
   {#if pinned}
     <button
-      type="button"
       class="pill action"
       onclick={() => {
         const id = message.service?.pinned_message_id;
+        // biome-ignore lint/suspicious/noEqualsToNull: optional chaining yields undefined here
         if (id != null) {
           onjump(id);
         }
       }}
+      type="button"
     >
       <Icon name="pin" size="0.8125rem" />
       <span>{text}</span>