[Bug] Support WASM for Web

### Bug Description

`universal_html` does not work with Flutter Wasm builds.

When embedding an editor that uses the universal_html package, the app works correctly with the standard flutter build web (HTML/CanvasKit), but fails under flutter build wasm.

### How to Reproduce

Build and run with:

`flutter build web --wasm`

### Operating System

Web

### AppFlowy Editor Version(s)

6.1.0