feat(canvas): 媒体转换节点 - 改进操作选择并支持完成后作为生成参考

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/constant/canvas.ts

@@ -26,7 +26,7 @@ export const NODE_DEFAULT_SIZE = {
     [CanvasNodeType.Compare]: { width: 520, height: 320, title: "对比" },
     [CanvasNodeType.Chart]: { width: 480, height: 320, title: "图表" },
     [CanvasNodeType.ColorGrade]: { width: 420, height: 360, title: "调色" },
-    [CanvasNodeType.MediaConversion]: { width: 380, height: 440, title: "转换" },
+    [CanvasNodeType.MediaConversion]: { width: 480, height: 460, title: "转换" },
 } satisfies Record<CanvasNodeType, { width: number; height: number; title: string }>;
 
 export const NODE_SPECS = {