custom modal header close icon (#7240)

* seahub custom modal header

* add custom modal header

* special modal use custom close

frontend/config/webpack.config.js

@@ -357,6 +357,7 @@ module.exports = function (webpackEnv) {
         .map(ext => `.${ext}`)
         .filter(ext => useTypeScript || !ext.includes('ts')),
       alias: {
+        '@': path.resolve(process.cwd(), 'src'),
         // Support React Native Web
         // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
         'react-native': 'react-native-web',