Store admin key in localStorage for unlock forms

setup.php

@@ -216,7 +216,7 @@ $submitted_key   = trim($_POST['admin_key_input'] ?? $_POST['admin_key_hidden']
       <div class="lock-sub">GridTV is already configured.<br>Enter your admin key to edit the settings.</div>
       <form method="POST" action="setup.php">
         <div class="lock-form">
-          <input type="password" name="admin_key_input" placeholder="Your admin key" autofocus autocomplete="off">
+          <input type="password" id="setupAdminKeyInput" name="admin_key_input" placeholder="Your admin key" autofocus autocomplete="off">
           <button type="submit" class="btn-submit" style="width:auto;padding:10px 20px;">Unlock</button>
         </div>
       </form>
@@ -349,6 +349,41 @@ function syncPersonalM3uToggle() {
 }
 allowPersonalEpgToggle?.addEventListener('change', syncPersonalM3uToggle);
 syncPersonalM3uToggle();
+
+const GRIDTV_ADMIN_KEY_STORAGE = 'gridtv-admin-key';
+const setupAdminKeyInput = document.getElementById('setupAdminKeyInput');
+const setupAdminHiddenInput = document.querySelector('input[name="admin_key_hidden"]');
+
+try {
+  const savedAdminKey = localStorage.getItem(GRIDTV_ADMIN_KEY_STORAGE) || '';
+  if (setupAdminKeyInput && savedAdminKey) setupAdminKeyInput.value = savedAdminKey;
+  if (setupAdminHiddenInput && savedAdminKey) setupAdminHiddenInput.value = savedAdminKey;
+} catch (_) {}
+
+if (setupAdminKeyInput?.form) {
+  setupAdminKeyInput.form.addEventListener('submit', () => {
+    try {
+      localStorage.setItem(GRIDTV_ADMIN_KEY_STORAGE, setupAdminKeyInput.value.trim());
+    } catch (_) {}
+  });
+}
+
+if (setupAdminHiddenInput?.form) {
+  const persistHiddenAdminKey = () => {
+    try {
+      const currentKey = setupAdminHiddenInput.value.trim();
+      if (currentKey) localStorage.setItem(GRIDTV_ADMIN_KEY_STORAGE, currentKey);
+    } catch (_) {}
+  };
+  persistHiddenAdminKey();
+  setupAdminHiddenInput.form.addEventListener('submit', persistHiddenAdminKey);
+}
+
+<?php if ($mode === 'success' && !empty($new_key)): ?>
+try {
+  localStorage.setItem(GRIDTV_ADMIN_KEY_STORAGE, <?= json_encode($new_key) ?>);
+} catch (_) {}
+<?php endif; ?>
 </script>
 </body>
 </html>