fix: Tooltip-Text erbt UI-Schriftart statt Serif

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

src/static/css/style.css

@@ -4898,6 +4898,7 @@ a.map-popup-article:hover {
     transform: translateX(-50%);
     background: var(--bg-secondary);
     color: var(--text-primary);
+    font-family: inherit;
     font-size: 12.5px;
     font-weight: 400;
     padding: 10px 14px;