修复mac判断问题

src/components/WorkflowCanvas.tsx

@@ -321,9 +321,6 @@ const getQuickAddSource = (node: Node, edges: Edge[]): { handleId: string; handl
   return outputHandle && handleType ? { handleId: outputHandle, handleType } : null;
 };
 
-// Detect if running on macOS for platform-specific trackpad behavior
-const isMacOS = typeof navigator !== 'undefined' && /Mac|iPod|iPhone|iPad/.test(navigator.platform);
-
 // Detect if a wheel event is from a mouse (vs trackpad)
 const isMouseWheel = (event: WheelEvent): boolean => {
   // Mouse scroll wheel typically uses deltaMode 1 (lines) or has large discrete deltas
@@ -448,6 +445,11 @@ export function WorkflowCanvas() {
   const [isSplitting, setIsSplitting] = useState(false);
   const [isBuildingWorkflow, setIsBuildingWorkflow] = useState(false);
   const [showNewProjectSetup, setShowNewProjectSetup] = useState(false);
+  const [isMacOSClient, setIsMacOSClient] = useState(false);
+
+  useEffect(() => {
+    setIsMacOSClient(/Mac|iPod|iPhone|iPad/.test(navigator.platform));
+  }, []);
 
   useEffect(() => {
     let cancelled = false;
@@ -1884,7 +1886,7 @@ export function WorkflowCanvas() {
       }
 
       // On macOS, differentiate trackpad from mouse
-      if (isMacOS) {
+      if (isMacOSClient) {
         if (isMouseWheel(event)) {
           // Mouse wheel → zoom if settings allow
           if (shouldZoom) {
@@ -1925,7 +1927,7 @@ export function WorkflowCanvas() {
     return () => {
       wrapper.removeEventListener('wheel', handleWheelNonPassive);
     };
-  }, [isModalOpen, zoomIn, zoomOut, getViewport, setViewport, canvasNavigationSettings]);
+  }, [isMacOSClient, isModalOpen, zoomIn, zoomOut, getViewport, setViewport, canvasNavigationSettings]);
 
   // Keyboard shortcuts for copy/paste and stacking selected nodes
   const handleKeyDown = useCallback((event: KeyboardEvent) => {
@@ -2552,7 +2554,7 @@ export function WorkflowCanvas() {
             ? false
             : canvasNavigationSettings.panMode === "always"
             ? false
-            : isMacOS && !isModalOpen
+            : isMacOSClient && !isModalOpen
         }
         selectionKeyCode={
           isModalOpen ? null
@@ -2569,7 +2571,7 @@ export function WorkflowCanvas() {
             ? true
             : canvasNavigationSettings.panMode === "middleMouse"
             ? [2]
-            : !isMacOS
+            : !isMacOSClient
         }
         selectNodesOnDrag={false}
         nodeDragThreshold={5}