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/test/generation-task-local.test.ts

@@ -192,7 +192,7 @@ test("Canvas task surfaces route Dreamina uncertainty through shared display sem
 
 test("Canvas fullscreen video restores large controls instead of keeping the compact node layout", async () => {
     const playerCSS = await Bun.file(new URL("../src/components/video-player.css", import.meta.url)).text();
-    expect(playerCSS).toContain(".canvas-video-player-compact:not([data-fullscreen])");
+    expect(playerCSS).toContain('.canvas-video-player[data-player-variant="compact"]:not([data-fullscreen])');
     expect(playerCSS).toContain("--media-fullscreen-button-size: 60px");
     expect(playerCSS).toContain("--media-slider-track-height: 8px");
     expect(playerCSS).toContain("min-height: 64px");