feat: Add conditional iframe refresh button for animated HTML ads

- Add ReloadOutlined icon import for refresh functionality
- Implement handleRefreshAd() to reload iframes with cache-busting timestamps
- Add refresh button next to share button with consistent styling
- Show refresh button only for ads containing HTML files (iframe content)
- Add user feedback messages for successful refresh operations
- Prevent unnecessary refresh buttons on image-only or video-only ads

HTML ads with animations can now be restarted without full page reload.
Button appears conditionally based on file type detection.

frontend/src/components/UserMenu.js

@@ -58,13 +58,6 @@ export default function UserMenu({ user, onLogout, darkMode, onToggleDarkMode, s
         onClick: clearAdsCache,
       },
       { type: 'divider' },
-      {
-        key: 'settings',
-        icon: <SettingOutlined />, 
-        label: 'Einstellungen (bald)',
-        disabled: true,
-      },
-      { type: 'divider' },
       {
         key: 'logout',
         icon: <LogoutOutlined />, 

frontend/src/pages/ProjectDetail.js

@@ -1,7 +1,7 @@
 import React, { useEffect, useState } from 'react';
 import { useParams, useNavigate } from 'react-router-dom';
 import { Tabs, Button, Spin, Skeleton, Result, Grid, Select, Layout, Tooltip, message } from 'antd';
-import { ArrowLeftOutlined, LoadingOutlined, LockOutlined, MinusOutlined, PlusOutlined, EllipsisOutlined, ShareAltOutlined } from '@ant-design/icons';
+import { ArrowLeftOutlined, LoadingOutlined, LockOutlined, MinusOutlined, PlusOutlined, EllipsisOutlined, ShareAltOutlined, ReloadOutlined } from '@ant-design/icons';
 import UserMenu from '../components/UserMenu';
 import FilePreview, { formatFileSize, formatDuration } from '../components/FilePreview';
 import debugLogger from '../utils/debugLogger';
@@ -85,6 +85,32 @@ function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overridePar
     }
   };
 
+  // iFrame Refresh Funktionalität
+  const handleRefreshAd = (adId, adName) => {
+    // Finde alle iFrames innerhalb des Ad-Containers
+    const adContainer = document.getElementById(adId);
+    if (adContainer) {
+      const iframes = adContainer.querySelectorAll('iframe');
+      let refreshedCount = 0;
+      
+      iframes.forEach((iframe) => {
+        if (iframe.src) {
+          // Füge einen Timestamp als URL-Parameter hinzu, um den Cache zu umgehen
+          const url = new URL(iframe.src);
+          url.searchParams.set('refresh', Date.now().toString());
+          iframe.src = url.toString();
+          refreshedCount++;
+        }
+      });
+      
+      if (refreshedCount > 0) {
+        message.success(`Animation${refreshedCount > 1 ? 'en' : ''} "${adName}" ${refreshedCount > 1 ? 'wurden' : 'wurde'} neu geladen!`);
+      } else {
+        message.info(`Keine Animationen in "${adName}" gefunden.`);
+      }
+    }
+  };
+
   useEffect(() => {
     async function fetchLogo() {
       if (!client || !project) {
@@ -153,6 +179,17 @@ function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overridePar
                               onClick={() => handleCopyLink(adId, ad.name)}
                             />
                           </Tooltip>
+                          {/* Refresh-Button nur bei HTML-Dateien (iFrames) anzeigen */}
+                          {Array.isArray(ad.files) && ad.files.some(file => file.type === 'html') && (
+                            <Tooltip title="Animationen neu laden">
+                              <Button 
+                                type="text" 
+                                shape="circle" 
+                                icon={<ReloadOutlined />} 
+                                onClick={() => handleRefreshAd(adId, ad.name)}
+                              />
+                            </Tooltip>
+                          )}
                         </div>
                       {/* Dateien unterhalb des Ads anzeigen */}
                       {Array.isArray(ad.files) && ad.files.length > 0 ? (