feat: add skip-to-content links and aria-labels for accessibility

app/layouts/admin.vue

@@ -1,5 +1,6 @@
 <template>
   <div class="site">
+    <a href="#main-content" class="sr-only focus:not-sr-only focus:absolute focus:z-[100] focus:p-3 focus:bg-[var(--bg)] focus:text-[var(--text)]">Skip to content</a>
     <!-- Desktop Sidebar -->
     <aside class="sidebar sidebar-desktop">
       <NuxtLink to="/" class="sidebar-brand">Ghost Guild</NuxtLink>
@@ -49,7 +50,7 @@
     </div>
 
     <!-- Main Content -->
-    <main class="main">
+    <main id="main-content" class="main">
       <TopStrip :page-path="currentPageName" />
       <slot />
     </main>