Fix PWA-Reload: __BUILD_TIME__ und version.txt aus selber Quelle; Fix QuickLinkIcon custom icons

frontend/src/App.jsx

@@ -455,17 +455,22 @@ function QuickLinksCarousel({ links }) {
 function QuickLinkIcon({ l }) {
   const [imgOk, setImgOk] = useState(true);
 
-  // Favicon-URL bauen: gespeicherten Wert nehmen oder aus URL ableiten
+  // Favicon nur wenn kein eigenes Icon gesetzt (Standard-🔗) oder bereits eine URL gespeichert ist
+  const useDefaultFavicon = !l.icon || l.icon === '🔗';
   const faviconUrl = (() => {
     if (l.icon && l.icon.startsWith('http')) return l.icon;
-    try {
-      const host = new URL(l.url).hostname;
-      return `https://www.google.com/s2/favicons?sz=64&domain=${host}`;
-    } catch { return null; }
+    if (useDefaultFavicon) {
+      try {
+        const host = new URL(l.url).hostname;
+        return `https://www.google.com/s2/favicons?sz=64&domain=${host}`;
+      } catch { return null; }
+    }
+    return null;
   })();
 
-  const showEmoji = !faviconUrl || !imgOk;
-  const fallbackEmoji = l.icon && !l.icon.startsWith('http') ? l.icon : '🔗';
+  const showImg   = !!faviconUrl && imgOk;
+  const showEmoji = !showImg;
+  const emoji     = (l.icon && !l.icon.startsWith('http')) ? l.icon : '🔗';
 
   return (
     <a href={l.url} target="_blank" rel="noopener noreferrer"
@@ -473,10 +478,10 @@ function QuickLinkIcon({ l }) {
         padding:'4px 2px', background:'rgba(255,255,255,0.04)',
         border:'1px solid rgba(255,255,255,0.08)', borderRadius:10,
         textDecoration:'none', height:48, width:'100%', boxSizing:'border-box', cursor:'pointer' }}>
-      {!showEmoji
+      {showImg
         ? <img src={faviconUrl} alt="" style={{width:18,height:18,objectFit:'contain'}}
             onError={() => setImgOk(false)}/>
-        : <span style={{ fontSize:16 }}>{fallbackEmoji}</span>
+        : <span style={{ fontSize:16 }}>{emoji}</span>
       }
       <span style={{ color:'rgba(255,255,255,0.65)', fontSize:8, fontFamily:'monospace',
         maxWidth:52, overflow:'hidden', textOverflow:'ellipsis', whiteSpace:'nowrap' }}>{l.title}</span>