fix(RegionMap.tsx): restrict map interactions to left mouse button for consistency

frontend/src/components/RegionMap.tsx

@@ -119,6 +119,7 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
   const [indicatedSystem, setIndicatedSystem] = useState<string | null>(null);
   const selectTimerRef = useRef<number | null>(null);
   const downClientPointRef = useRef<{ x: number; y: number } | null>(null);
+  const mouseButtonRef = useRef<number | null>(null);
 
   // New: shift-drag circle selection state (VIA mode)
   const [shiftSelecting, setShiftSelecting] = useState(false);
@@ -534,8 +535,10 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
   const handleMouseDown = useCallback((e: React.MouseEvent) => {
     if (!svgRef.current) return;
 
-    // SHIFT + VIA mode: start circle selection
-    if (viaMode && e.shiftKey) {
+    mouseButtonRef.current = e.button;
+
+    // SHIFT + VIA mode: start circle selection (left button only)
+    if (viaMode && e.shiftKey && e.button === 0) {
       e.preventDefault();
       e.stopPropagation();
       const svgPt = clientToSvg(e.clientX, e.clientY);
@@ -550,6 +553,13 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
       return;
     }
 
+    // Only left button initiates selection/panning
+    if (e.button !== 0) {
+      clearSelectTimer();
+      setIsSelecting(false);
+      return;
+    }
+
     // record down point (client) and seed pan origin
     const rect = svgRef.current.getBoundingClientRect();
     setLastPanPoint({ x: e.clientX - rect.left, y: e.clientY - rect.top });
@@ -625,9 +635,11 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
     // if dragging node, delegate
     if (draggingNode) { if (e) handleSvgMouseUp(e); return; }
 
-    // Commit shift selection if active
+    // Commit shift selection if active (only if left button initiated)
     if (shiftSelecting) {
+      if (mouseButtonRef.current === 0) {
         commitShiftSelection();
+      }
       setShiftSelecting(false);
       setShiftCenter(null);
       setShiftRadius(0);
@@ -636,6 +648,18 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
       setIsSelecting(false);
       setIndicatedSystem(null);
       downClientPointRef.current = null;
+      mouseButtonRef.current = null;
+      return;
+    }
+
+    // Ignore non-left button for selection commit
+    if (mouseButtonRef.current !== 0) {
+      clearSelectTimer();
+      setIsPanning(false);
+      setIsSelecting(false);
+      setIndicatedSystem(null);
+      downClientPointRef.current = null;
+      mouseButtonRef.current = null;
       return;
     }
 
@@ -643,6 +667,7 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
 
     if (isPanning) {
       setIsPanning(false);
+      mouseButtonRef.current = null;
       return;
     }
 
@@ -661,6 +686,7 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
     setIsSelecting(false);
     setIndicatedSystem(null);
     downClientPointRef.current = null;
+    mouseButtonRef.current = null;
   }, [draggingNode, isPanning, indicatedSystem, positions, systems, shiftSelecting, commitShiftSelection]);
 
   const handleWheel = useCallback((e: React.WheelEvent) => {
@@ -832,7 +858,7 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
   useEffect(() => {
     const onWindowMouseUp = () => {
       // if shift selection ongoing, commit on global mouseup as well
-      if (shiftSelecting) {
+      if (shiftSelecting && mouseButtonRef.current === 0) {
         commitShiftSelection();
       }
       clearSelectTimer();
@@ -843,6 +869,7 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
       setShiftCenter(null);
       setShiftRadius(0);
       downClientPointRef.current = null;
+      mouseButtonRef.current = null;
     };
     window.addEventListener('mouseup', onWindowMouseUp);
     return () => window.removeEventListener('mouseup', onWindowMouseUp);