🗑️ Remove admin contact email line and CSS

public/admin.html

@@ -237,10 +237,6 @@
   <!-- Toast -->
   <div id="toastContainer"></div>
 
-  <div class="admin-contact">
-    contact developer for features/issues: <a href="mailto:null422303@mail.com">null422303@mail.com</a>
-  </div>
-
   <script src="/js/admin.js"></script>
 </body>
 </html>

public/css/admin.css

@@ -845,29 +845,8 @@ body {
   }
 }
 
-/* ── Contact footer ──────────────────────────────────────────────────── */
-.admin-contact {
-  text-align: center;
-  padding: 12px 20px 24px;
-  font-size: 0.82rem;
-  color: #000;
-  font-family: var(--font-body);
-}
-
-.admin-contact a {
-  color: #000;
-  text-decoration: underline;
-}
-
 /* ── Responsive ────────────────────────────────────────────────────────── */
 @media (max-width: 768px) {
-  .admin-contact {
-    font-size: 0.78rem;
-    padding: 16px 16px 28px;
-    line-height: 1.5;
-    word-break: break-word;
-  }
-
   .topbar-inner { padding: 0 20px; flex-wrap: wrap; height: auto; padding: 12px 20px; gap: 12px; }
   .topbar-nav { order: 3; width: 100%; overflow-x: auto; }
   .main { padding: 24px 20px 60px; }