fix: Chat-Overlay Breite auf 70% der Fenstergröße

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/static/css/style.css

@@ -4848,7 +4848,7 @@ a.map-popup-article:hover {
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
-    width: min(700px, calc(100vw - 48px));
+    width: min(70vw, calc(100vw - 48px));
     height: min(80vh, calc(100vh - 48px));
     border-radius: 12px;
     z-index: 10000;