fix: Chat-Button höher positioniert um Gridstack-Resize-Handle nicht zu verdecken

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

src/static/css/style.css

@@ -4619,7 +4619,7 @@ a.map-popup-article:hover {
 
 .chat-toggle-btn {
     position: fixed;
-    bottom: 24px;
+    bottom: 80px;
     right: 24px;
     width: 52px;
     height: 52px;
@@ -4650,7 +4650,7 @@ a.map-popup-article:hover {
 
 .chat-window {
     position: fixed;
-    bottom: 88px;
+    bottom: 144px;
     right: 24px;
     width: 380px;
     height: 520px;