perf(canvas): 画布媒体 - 优化媒体加载、播放器与节点交互 (#357)

Merge origin/main at fb089b2 and retain canvas media performance, player layout, and interaction updates.

Co-authored-by: ddCat <2695092045@qq.com>

web/src/pages/create/creation-assets.ts

@@ -1,5 +1,6 @@
 import type { UploadedFile } from "@/services/file-storage";
 import type { UploadedImage } from "@/services/image-storage";
+import { canvasVideoAssetPreviewUrl } from "@/lib/canvas/canvas-media-preview";
 import type { ExternalAssetPickerReference } from "@/lib/plugins/plugin-types";
 import type { Asset, AudioAsset, ImageAsset, NewAsset } from "@/stores/use-asset-store";
 import type { ReferenceImage } from "@/types/image";
@@ -279,7 +280,7 @@ export function creationVideoAsset({ title, uploaded, metadata }: { title: strin
     return {
         kind: "video",
         title: title.trim() || "创作视频",
-        coverUrl: uploaded.url,
+        coverUrl: canvasVideoAssetPreviewUrl(uploaded.url, uploaded.preview?.url),
         tags: ["创作"],
         status: "confirmed",
         source: "创作页",