拖拽节点时隐藏生成工作台/高清面板/工具胶囊

拖拽中通过 canvas-node-drag-active 祖先类将 GenerationComposer、
NodeHighDefinitionPanel（含视频高清）及节点动作胶囊 display:none，
松手移除类后自动恢复显示。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/canvas/ActiveNodeComposerHost.tsx

@@ -52,7 +52,7 @@ function ComposerHostLayer({ targetNodeId }: { targetNodeId: string | null }) {
   if (!isMounted || !mountedNodeId || !frame) return null;
 
   return (
-    <div data-active-node-composer-host className="nodrag nopan nowheel" style={frame.frameStyle}>
+    <div data-active-node-composer-host className="nodrag nopan nowheel [.canvas-node-drag-active_&]:hidden" style={frame.frameStyle}>
       <BelowNodeAnchor>
         <div hidden={!shouldShow} className="pointer-events-auto flex flex-col items-center gap-2">
           <GenerationComposer
@@ -75,7 +75,7 @@ function HighDefinitionHostLayer({ nodeId }: { nodeId: string | null }) {
   const frame = useNodeCanvasFrame(nodeId);
   if (!nodeId || !frame) return null;
   return (
-    <div data-active-node-high-definition-host className="nodrag nopan nowheel" style={frame.frameStyle}>
+    <div data-active-node-high-definition-host className="nodrag nopan nowheel [.canvas-node-drag-active_&]:hidden" style={frame.frameStyle}>
       <BelowNodeAnchor>
         <NodeHighDefinitionPanel node={frame.node} />
       </BelowNodeAnchor>

src/components/nodes/NodeActionCapsule.tsx

@@ -53,7 +53,7 @@ export const NodeActionCapsuleShell = forwardRef<HTMLDivElement, NodeActionCapsu
       ref={ref}
       onMouseDown={onMouseDown}
       style={style}
-      className={`nodrag nopan absolute left-1/2 z-[10002] flex -translate-x-1/2 items-center gap-2 rounded-xl border border-[var(--border-subtle)] bg-[var(--surface-2)] px-4 py-3 text-xl text-[var(--text-secondary)] shadow-[var(--shadow-panel)] ${topClassName} ${className}`}
+      className={`nodrag nopan absolute left-1/2 z-[10002] flex -translate-x-1/2 items-center gap-2 rounded-xl border border-[var(--border-subtle)] bg-[var(--surface-2)] px-4 py-3 text-xl text-[var(--text-secondary)] shadow-[var(--shadow-panel)] [.canvas-node-drag-active_&]:hidden ${topClassName} ${className}`}
     >
       {children}
     </div>