v1.4 - Login fixes, etc

frontend/src/routes/admin/+page.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import { api } from '$lib/api';
-  import { adminSession } from '$lib/session';
+  import { adminSession, sessionHydrated } from '$lib/session';
 
   let { data } = $props();
 
@@ -65,7 +65,15 @@
   </div>
 </section>
 
-{#if !$adminSession}
+{#if !$sessionHydrated}
+  <section class="signin-card loading-card">
+    <div class="signin-copy">
+      <p class="eyebrow">Checking Session</p>
+      <h3>Restoring the Lean 101 admin session before deciding whether sign-in is needed.</h3>
+      <p>The admin sign-in form only appears when no saved operator session is available.</p>
+    </div>
+  </section>
+{:else if !$adminSession}
   <section class="signin-card">
     <div class="signin-copy">
       <p class="eyebrow">Admin Sign-In</p>
@@ -253,6 +261,11 @@
     align-items: center;
   }
 
+  .loading-card {
+    grid-template-columns: 1fr;
+    min-height: 10rem;
+  }
+
   .signin-copy h3,
   .live-banner h3,
   .card-toolbar h3 {