fix: use untrack() in \$state initialisers to silence state_referenced_locally warnings

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

packages/frontend/src/routes/videos/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { untrack } from "svelte";
   import { _ } from "svelte-i18n";
   import { goto } from "$app/navigation";
   import { page } from "$app/state";
@@ -17,7 +18,7 @@
   const timeAgo = new TimeAgo("en");
   const { data } = $props();
 
-  let searchValue = $state(data.search ?? "");
+  let searchValue = $state(untrack(() => data.search ?? ""));
   $effect(() => {
     searchValue = data.search ?? "";
   });