Fix webpack issue when enable sandbox

[abbie982]

To enable the sandbox in browser webview of desktop app, we need to change the webpack config for preload.js in:/packages/injected/webpack.config.cjs as follow:

const nativeConfig = merge(commonConfig, {
  target: 'electron-preload',
  entry: {
    injectedDesktop: './src/injectedDesktop.ts',
  },
});

to the new one:

const nativeConfig = merge(commonConfig, {
  target: 'web',
  entry: {
    injectedDesktop: './src/injectedDesktop.ts',
  },
  externals: {
    electron: 'commonjs electron', // 将 Electron 标记为外部模块
  },
});

Otherwise, there will be a issue caused by import electron in preload.js, because of the limitation of sandbox such as limitation in require.

PR related to this is here:Change preload.js webpack config to support sandbox

PR related to app's sandbox config is here:Enable sandbox in browser's webview of desktop

#245