fix(RegionMap.tsx): add mouseup event listener to reset panning and selection states

frontend/src/components/RegionMap.tsx

@@ -745,6 +745,18 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
     return () => document.removeEventListener('click', handleClickOutside);
   }, []);
 
+  useEffect(() => {
+    const onWindowMouseUp = () => {
+      clearSelectTimer();
+      setIsPanning(false);
+      setIsSelecting(false);
+      setIndicatedSystem(null);
+      downClientPointRef.current = null;
+    };
+    window.addEventListener('mouseup', onWindowMouseUp);
+    return () => window.removeEventListener('mouseup', onWindowMouseUp);
+  }, []);
+
   if (isLoading) {
     return (
       <div className="h-full w-full bg-gradient-to-br from-slate-900 via-slate-800 to-slate-900 flex items-center justify-center">