✨feature: Update layout to have footer, update export button for all/selected prompt export text

src/pages/edit.astro

@@ -19,12 +19,12 @@ const supabaseKey = import.meta.env.PUBLIC_SUPABASE_ANON_KEY;
       hidden
     ></div>
 
-    <div class="border-b p-4">
+    <header class="border-b p-4">
       <h1 class="text-2xl font-bold">Prompt Catalog - Add New Prompt</h1>
       <p class="text-sm mt-1">Add a new AI prompt to the catalog</p>
-    </div>
+    </header>
 
-    <div class="flex h-screen">
+    <main class="flex">
       <Sidebar />
 
       <div class="flex-1 flex flex-col overflow-hidden">
@@ -32,7 +32,11 @@ const supabaseKey = import.meta.env.PUBLIC_SUPABASE_ANON_KEY;
           <div id="edit-root">Loading...</div>
         </main>
       </div>
-    </div>
+    </main>
+
+    <footer class="border-t p-4 text-center text-sm">
+      &copy; {new Date().getFullYear()} Prompt Catalog
+    </footer>
 
     <script type="module">
       import { createClient } from 'https://cdn.jsdelivr.net/npm/@supabase/supabase-js/+esm';