added admin control panel

frontend/src/pages/posts/[slug].astro

@@ -63,4 +63,32 @@ function formatSlug(slug: string) {
       <div class="prose prose-invert max-w-none" set:html={html} />
     )}
   </article>
+
+  <script>
+    if (localStorage.getItem('admin_token')) {
+      const editBtn = document.getElementById('edit-btn');
+      if (editBtn) {
+        editBtn.style.display = 'inline-flex';
+      }
+    }
+  </script>
+</Layout>
+1.5-5.5Z"/><path d="m15 5 4 4"/></svg>
+            Edit
+          </a>
+        </div>
+      )}
+    </header>
+
+    {error && (
+      <div class="text-red text-center py-12">
+        <h2 class="text-2xl font-bold mb-4">{error}</h2>
+        <a href="/" class="text-blue underline">Return home</a>
+      </div>
+    )}
+
+    {post && (
+      <div class="prose prose-invert max-w-none" set:html={html} />
+    )}
+  </article>
 </Layout>