feat(canvas): 画布工作台 - 新增生成副本并修复大型画布性能、素材同步与删除校验

统一图片与视频副本的生成落点并保留参考连接。\n优化大型画布节点虚拟化、媒体懒加载、拖拽与详情进入路径。\n修复素材主版本 ID 同步及删除时的画布独立引用校验。

web/test/asset-remote-sync.test.ts

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+import { describe, expect, test } from "bun:test";
+
+import { assetForRemoteSync } from "@/lib/asset-remote-sync";
+import type { Asset } from "@/stores/use-asset-store";
+
+function imageAsset(primaryVersionId?: string): Asset {
+    return {
+        id: "asset-1",
+        kind: "image",
+        title: "测试素材",
+        coverUrl: "opaque://asset",
+        tags: [],
+        primaryVersionId,
+        createdAt: "2026-09-01T00:00:00.000Z",
+        updatedAt: "2026-09-01T00:00:00.000Z",
+        data: { dataUrl: "opaque://asset", width: 1, height: 1, bytes: 1, mimeType: "image/png" },
+    };
+}
+
+describe("asset remote sync", () => {
+    test("removes an invalid historical primary version id only from the remote payload", () => {
+        const source = imageAsset("generation-result:" + "x".repeat(40));
+
+        const remote = assetForRemoteSync(source);
+
+        expect(remote.primaryVersionId).toBeUndefined();
+        expect(source.primaryVersionId).toBe("generation-result:" + "x".repeat(40));
+        expect(remote).not.toBe(source);
+    });
+
+    test("preserves a valid backend version uuid", () => {
+        const source = imageAsset("123e4567-e89b-12d3-a456-426614174000");
+
+        expect(assetForRemoteSync(source)).toBe(source);
+        expect(source.primaryVersionId).toBe("123e4567-e89b-12d3-a456-426614174000");
+    });
+});