fix missing info dialog selectors

public/js/legal-ui.js

@@ -2,16 +2,26 @@
   'use strict';
 
   const DROPDOWN_ANIMATION_MS = 180;
-  const dialog = document.getElementById('info-dialog');
-  const title = document.getElementById('info-dialog-title');
-  const dropdown = document.getElementById('info-dropdown');
-  const closeButton = document.getElementById('info-close');
-  const infoButton = document.getElementById('info-button');
   const pageTitles = Object.freeze({
     privacy: 'Datenschutzerklärung',
     imprint: 'Impressum',
     technology: 'Cookies und Technik'
   });
+
+  const dialog = document.getElementById('info-dialog');
+  const title = document.getElementById('info-dialog-title')
+    ?? dialog?.querySelector('h1, h2, .info-dialog-title')
+    ?? null;
+  const dropdown = document.getElementById('info-dropdown')
+    ?? document.querySelector('.info-dropdown')
+    ?? null;
+  const infoButton = document.getElementById('info-button')
+    ?? document.querySelector('[aria-controls="info-dropdown"], .info-button')
+    ?? null;
+  const closeButton = document.getElementById('info-close')
+    ?? dialog?.querySelector('[data-info-close], .info-close, .info-dialog-close, button[aria-label="Dialog schließen"], button[aria-label="Schließen"]')
+    ?? null;
+
   let dropdownOpen = false;
   let dropdownCloseTimer = null;
 
@@ -23,7 +33,7 @@
   }
 
   function activate(element, handler) {
-    if (!element) return;
+    if (!element || typeof element.addEventListener !== 'function') return;
     element.addEventListener('pointerup', event => {
       if (!isActivation(event)) return;
       event.preventDefault();
@@ -96,8 +106,18 @@
     return elementContains(infoButton, target) || elementContains(dropdown, target);
   }
 
+  function isProgressStorageEnabled() {
+    if (!ns.PrivacyStorage || typeof ns.PrivacyStorage.isProgressStorageEnabled !== 'function') return false;
+    return ns.PrivacyStorage.isProgressStorageEnabled();
+  }
+
+  function setProgressStorageEnabled(enabled) {
+    if (!ns.PrivacyStorage || typeof ns.PrivacyStorage.setProgressStorageEnabled !== 'function') return false;
+    return ns.PrivacyStorage.setProgressStorageEnabled(enabled);
+  }
+
   function syncStorageToggles() {
-    const enabled = ns.PrivacyStorage.isProgressStorageEnabled();
+    const enabled = isProgressStorageEnabled();
     document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
       toggle.checked = enabled;
     });
@@ -110,7 +130,7 @@
     const page = document.querySelector(`[data-info-page="${name}"]`);
     if (!page) return;
 
-    title.textContent = pageTitles[name] ?? 'Informationen';
+    if (title) title.textContent = pageTitles[name] ?? 'Informationen';
     document.querySelectorAll('[data-info-page]').forEach(item => {
       item.hidden = item !== page;
     });
@@ -118,7 +138,13 @@
     if (content) content.scrollTop = 0;
   }
 
+  function focusSafely(element) {
+    if (!element || typeof element.focus !== 'function') return;
+    element.focus({ preventScroll: true });
+  }
+
   function openDialog(name = 'privacy') {
+    if (!dialog) return;
     const pageName = Object.prototype.hasOwnProperty.call(pageTitles, name) ? name : 'privacy';
     setDropdownOpen(false);
     showPage(pageName);
@@ -127,20 +153,22 @@
       if (typeof dialog.showModal === 'function') dialog.showModal();
       else dialog.setAttribute('open', '');
     }
-    closeButton.focus();
+    focusSafely(closeButton ?? dialog);
   }
 
   function closeDialog() {
+    if (dialog) {
       if (typeof dialog.close === 'function') dialog.close();
       else dialog.removeAttribute('open');
+    }
     setDropdownOpen(false);
-    infoButton.focus();
+    focusSafely(infoButton);
   }
 
   function bindStorageToggles() {
     document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
       toggle.addEventListener('change', event => {
-        const enabled = ns.PrivacyStorage.setProgressStorageEnabled(event.currentTarget.checked);
+        const enabled = setProgressStorageEnabled(event.currentTarget.checked);
         syncStorageToggles();
         document.dispatchEvent(new CustomEvent('wegwichtel:progress-storage-changed', {
           detail: { enabled }
@@ -160,12 +188,13 @@
     setDropdownOpen(false);
   });
   document.addEventListener('keydown', event => {
-    if (!dropdownOpen || event.key !== 'Escape' || dialog.open) return;
+    if (!dropdownOpen || event.key !== 'Escape' || dialog?.open) return;
     event.preventDefault();
     setDropdownOpen(false);
-    infoButton.focus();
+    focusSafely(infoButton);
   });
 
+  if (dialog) {
     dialog.addEventListener('pointerup', event => {
       if (event.target !== dialog || !isActivation(event)) return;
       event.preventDefault();
@@ -176,6 +205,7 @@
       event.preventDefault();
       closeDialog();
     });
+  }
 
   bindStorageToggles();
   syncStorageToggles();