feat(canvas): 多图批次 - 子图操作条补齐（下载/副本/设主图/失败重试删除）

- 展开批次子图悬浮操作条：成功子项下载/创建副本/设为主图，失败子项重试/删除
- 批次主图位常驻下载按钮
- 通过 CanvasNodeActionContext 注入画布级动作（download/duplicate/delete），不改 world-layers 数据模型

web/src/components/canvas/canvas-node-action-context.ts

@@ -0,0 +1,18 @@
+import { createContext, useContext } from "react";
+
+import type { CanvasNodeData } from "@/types/canvas";
+
+// 批次子图操作条（下载/创建副本/删除）与主图位下载需要调用画布级动作，
+// 但画布节点经 CanvasProjectWorldLayers 渲染、不便逐个透传 handler，
+// 通过 Context 注入，避免改动 world-layers。无 Provider 时静默降级为 no-op。
+export type CanvasNodeActionContextValue = {
+    download?: (node: CanvasNodeData) => void;
+    duplicate?: (node: CanvasNodeData) => void;
+    deleteNode?: (node: CanvasNodeData) => void;
+};
+
+export const CanvasNodeActionContext = createContext<CanvasNodeActionContextValue>({});
+
+export function useCanvasNodeActions() {
+    return useContext(CanvasNodeActionContext);
+}

web/src/components/canvas/canvas-node.tsx

@@ -1,6 +1,8 @@
 import React, { useCallback, useEffect, useRef, useState } from "react";
 import type { ReactNode } from "react";
-import { AlertCircle, BookOpenCheck, CheckCircle2, ChevronRight, Clapperboard, Image as ImageIcon, Lock, Maximize2, Music2, Pencil, Plus, Replace, Settings2, Star, Type, Upload, Video } from "lucide-react";
+import { AlertCircle, BookOpenCheck, CheckCircle2, ChevronRight, Clapperboard, Copy, Download, Image as ImageIcon, Lock, Maximize2, Music2, Pencil, Plus, RefreshCw, Replace, Settings2, Star, Trash2, Type, Upload, Video } from "lucide-react";
+
+import { useCanvasNodeActions } from "./canvas-node-action-context";
 
 import { canvasThemes } from "@/lib/canvas-theme";
 import { resourceStorageLabel, resourceStorageLocation, resourceStorageTitle } from "@/lib/canvas/resource-storage-status";
@@ -106,6 +108,7 @@ export const CanvasNode = React.memo(function CanvasNode({
     const [isEditingContent, setIsEditingContent] = useState(false);
     const [isEditingTitle, setIsEditingTitle] = useState(false);
     const [titleDraft, setTitleDraft] = useState(data.title);
+    const { download: downloadNode, duplicate: duplicateNode, deleteNode } = useCanvasNodeActions();
     const hasImageContent = data.type === CanvasNodeType.Image && Boolean(data.metadata?.content);
     const hasVideoContent = data.type === CanvasNodeType.Video && Boolean(data.metadata?.content);
     const hasAudioContent = data.type === CanvasNodeType.Audio && Boolean(data.metadata?.content);
@@ -428,6 +431,30 @@ export const CanvasNode = React.memo(function CanvasNode({
                         {data.metadata?.locked ? <NodeLockBadge theme={theme} /> : null}
                     </div>
                 ) : null}
+                {/* 批次子图操作条：成功子项提供下载/副本/设为主图，失败子项提供重试/删除 */}
+                {isBatchChild && !readOnly && (hasImageContent || data.metadata?.status === "error") && (hovered || isSelected) ? (
+                    <div
+                        className="absolute inset-x-0 bottom-2 z-[var(--node-z-overlay)] flex justify-center"
+                        onMouseDown={(event) => event.stopPropagation()}
+                        onPointerDown={(event) => event.stopPropagation()}
+                    >
+                        <div className="flex items-center gap-0.5 rounded-[var(--r-md)] border px-1 py-1 backdrop-blur-xl" style={{ background: `${theme.toolbar.panel}e6`, borderColor: theme.toolbar.border }}>
+                            {hasImageContent ? <BatchChildActionButton theme={theme} label="下载图片" icon={<Download className="size-3.5" />} onClick={() => downloadNode?.(data)} /> : null}
+                            {hasImageContent ? <BatchChildActionButton theme={theme} label="创建副本" icon={<Copy className="size-3.5" />} onClick={() => duplicateNode?.(data)} /> : null}
+                            {hasImageContent ? (
+                                <BatchChildActionButton theme={theme} label={batchPrimary ? "当前主图" : "设为主图"} icon={<Star className={`size-3.5 ${batchPrimary ? "fill-current" : ""}`} style={{ color: theme.accent.primary }} />} onClick={() => onSetBatchPrimary?.(data)} />
+                            ) : null}
+                            {data.metadata?.status === "error" ? <BatchChildActionButton theme={theme} label="重试" icon={<RefreshCw className="size-3.5" />} onClick={() => onRetry?.(data)} /> : null}
+                            {data.metadata?.status === "error" ? <BatchChildActionButton theme={theme} label="删除" icon={<Trash2 className="size-3.5" />} danger onClick={() => deleteNode?.(data)} /> : null}
+                        </div>
+                    </div>
+                ) : null}
+                {/* 批次主图位（折叠根节点封面）常驻下载按钮 */}
+                {isBatchRoot && hasImageContent && !readOnly ? (
+                    <div className="absolute bottom-2 right-2 z-[var(--node-z-overlay)]" onMouseDown={(event) => event.stopPropagation()} onPointerDown={(event) => event.stopPropagation()}>
+                        <BatchChildActionButton theme={theme} label="下载主图" icon={<Download className="size-3.5" />} onClick={() => downloadNode?.(data)} />
+                    </div>
+                ) : null}
                 {assetTags.length || (showImageInfo && hasImageContent) ? (
                     <div className="pointer-events-none absolute inset-x-3 bottom-3 z-[var(--node-z-overlay)] flex items-end justify-between gap-2">
                         {assetTags.length ? <AssetTagBadges tags={assetTags} theme={theme} /> : null}
@@ -539,6 +566,24 @@ function BatchPrimaryBadge({ visible, selected, theme, onSelect }: { visible: bo
     );
 }
 
+function BatchChildActionButton({ theme, label, icon, onClick, danger = false }: { theme: CanvasTheme; label: string; icon: ReactNode; onClick: () => void; danger?: boolean }) {
+    return (
+        <button
+            type="button"
+            data-canvas-no-zoom
+            className="canvas-node-inline-action grid size-8 place-items-center rounded-[var(--r-sm)] p-0 backdrop-blur-xl transition-colors focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2"
+            style={{ color: danger ? theme.accent.danger : theme.node.text, outlineColor: theme.accent.primary }}
+            title={label}
+            aria-label={label}
+            onClick={(event) => { event.stopPropagation(); onClick(); }}
+            onMouseDown={(event) => event.stopPropagation()}
+            onPointerDown={(event) => event.stopPropagation()}
+        >
+            {icon}
+        </button>
+    );
+}
+
 function AssetTagBadges({ tags, theme }: { tags: string[]; theme: (typeof canvasThemes)[keyof typeof canvasThemes] }) {
     return (
         <div className="flex min-w-0 flex-1 flex-wrap items-end gap-1">

web/src/pages/canvas/project.tsx

@@ -80,6 +80,7 @@ import { CanvasProjectMediaDialogs } from "./canvas-project-media-dialogs";
 import { CanvasProjectSelectionToolbar } from "./canvas-project-selection-toolbar";
 import { CanvasProjectStatusDialogs } from "./canvas-project-status-dialogs";
 import { CanvasProjectWorldLayers } from "./canvas-project-world-layers";
+import { CanvasNodeActionContext } from "@/components/canvas/canvas-node-action-context";
 import { CanvasRefreshShell } from "./canvas-refresh-shell";
 import type { CanvasImageEmotionPayload } from "@/components/canvas/canvas-node-emotion-panel";
 import { CanvasEmotionWorkspace } from "@/components/canvas/canvas-emotion-workspace";
@@ -1779,6 +1780,7 @@ function InfiniteCanvasPage() {
                                 onFileDragLeave={handleFileDragLeave}
                                 onFileDragOver={handleFileDragOver}
                             >
+                                <CanvasNodeActionContext.Provider value={{ download: downloadNodeImage, duplicate: (node) => duplicateNode(node.id), deleteNode: (node) => deleteNodes(new Set([node.id])) }}>
                                 <CanvasProjectWorldLayers
                                     projectId={projectId}
                                     viewportScale={viewport.k}
@@ -1847,6 +1849,7 @@ function InfiniteCanvasPage() {
                                     onOpenDrawing={openDrawingNode}
                                     onStartBatchConnection={startBatchConnection}
                                 />
+                                </CanvasNodeActionContext.Provider>
                             </InfiniteCanvas>
 
                             <CanvasActiveTaskPanel tasks={activeTasks} topInset={focusMode ? "var(--space-3)" : "var(--canvas-topbar-offset)"} />