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 2b7375f and retain canvas media performance, player layout, and interaction updates.

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

web/src/lib/canvas/canvas-node-timestamps.ts

@@ -13,6 +13,8 @@ const HYDRATED_MEDIA_KEYS = new Set<keyof CanvasNodeMetadata>([
     "bytes",
     "mimeType",
     "durationMs",
+    "hasAudio",
+    "videoPreview",
     "drawingPreviewUrl",
 ]);