feat: add Meta title tags to all admin pages

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

packages/frontend/src/routes/admin/articles/new/+page.svelte

@@ -11,6 +11,7 @@
   import { TagsInput } from "$lib/components/ui/tags-input";
   import { DatePicker } from "$lib/components/ui/date-picker";
   import { FileDropZone, MEGABYTE } from "$lib/components/ui/file-drop-zone";
+  import Meta from "$lib/components/meta/meta.svelte";
 
   let title = $state("");
   let slug = $state("");
@@ -75,6 +76,8 @@
   }
 </script>
 
+<Meta title={$_("admin.article_form.new_title")} description={null} />
+
 <div class="p-3 sm:p-6">
   <div class="flex items-center gap-4 mb-6">
     <Button variant="ghost" href="/admin/articles" size="sm">