fix(canvas): split compare into two panes for transparent outputs

components/canvas/nodes/ImageNode.tsx

@@ -287,6 +287,7 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
   // 文件输入的 ref
   const fileInputRef = useRef<HTMLInputElement>(null);
   const containerRef = useRef<HTMLDivElement>(null);
+  const compareFrameRef = useRef<HTMLDivElement>(null);
   
   const updateNode = useCanvasStore((state) => state.updateNode);
   const deleteNode = useCanvasStore((state) => state.deleteNode);
@@ -387,6 +388,17 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
     }
   }, [hasCompareSource, isThisNodePicking]);
 
+  const updateCompareSplitByClientX = useCallback((clientX: number) => {
+    const frame = compareFrameRef.current;
+    if (!frame) return;
+
+    const rect = frame.getBoundingClientRect();
+    if (rect.width <= 0) return;
+
+    const rawPercent = ((clientX - rect.left) / rect.width) * 100;
+    setCompareSplitPercent(Math.max(0, Math.min(100, rawPercent)));
+  }, []);
+
   useEffect(() => {
     if (!isCompareMode) return;
 
@@ -1589,6 +1601,7 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
           <div className="relative w-full h-full">
             {isCompareMode && hasCompareSource ? (
               <div
+                ref={compareFrameRef}
                 className="relative h-full w-full overflow-hidden bg-muted/30 select-none cursor-col-resize"
                 style={{ touchAction: "none" }}
                 data-canvas-no-drag="true"
@@ -1600,22 +1613,31 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
                   updateCompareSplitByClientX(event.clientX);
                 }}
               >
-                <img
-                  src={compareSource}
-                  alt={`${displayTitle}-原图`}
-                  className="absolute inset-0 h-full w-full object-contain"
-                  draggable={false}
-                />
+                <div
+                  className="pointer-events-none absolute inset-0 overflow-hidden"
+                  style={{
+                    clipPath: `inset(0 ${100 - compareSplitPercent}% 0 0)`,
+                  }}
+                >
+                  <div className="absolute inset-0 bg-muted/30" />
+                  <img
+                    src={data.src}
+                    alt={displayTitle}
+                    className="absolute inset-0 h-full w-full object-contain"
+                    draggable={false}
+                  />
+                </div>
                 <div
                   className="pointer-events-none absolute inset-0 overflow-hidden"
                   style={{
                     clipPath: `inset(0 0 0 ${compareSplitPercent}%)`,
                   }}
                 >
+                  <div className="absolute inset-0 bg-muted/30" />
                   <img
-                    src={data.src}
-                    alt={displayTitle}
-                    className="h-full w-full object-contain"
+                    src={compareSource}
+                    alt={`${displayTitle}-原图`}
+                    className="absolute inset-0 h-full w-full object-contain"
                     draggable={false}
                   />
                 </div>
@@ -1631,10 +1653,10 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
                   &lt;&gt;
                 </div>
                 <div className="pointer-events-none absolute left-2 top-2 rounded bg-black/55 px-1.5 py-0.5 text-[10px] text-white">
-                  原图
+                  新图
                 </div>
                 <div className="pointer-events-none absolute right-2 top-2 rounded bg-black/55 px-1.5 py-0.5 text-[10px] text-white">
-                  新图
+                  原图
                 </div>
               </div>
             ) : (