chore: Update storybook settings to widget stories (#7595)

.storybook/main.js

@@ -23,6 +23,18 @@ module.exports = {
     },
     '@storybook/addon-links',
     '@storybook/addon-essentials',
+    {
+      /**
+       * Fix Storybook issue with PostCSS@8
+       * @see https://github.com/storybookjs/storybook/issues/12668#issuecomment-773958085
+       */
+      name: '@storybook/addon-postcss',
+      options: {
+        postcssLoaderOptions: {
+          implementation: require('postcss'),
+        },
+      },
+    },
   ],
   webpackFinal: config => {
     const newConfig = {
@@ -35,7 +47,7 @@ module.exports = {
 
     newConfig.module.rules.push({
       test: /\.scss$/,
-      use: ['style-loader', 'css-loader', 'sass-loader'],
+      use: ['style-loader', 'css-loader', 'postcss-loader', 'sass-loader'],
       include: path.resolve(__dirname, '../app/javascript'),
     });
 

.storybook/preview.js

@@ -4,10 +4,12 @@ import Vuex from 'vuex';
 import VueI18n from 'vue-i18n';
 import Vuelidate from 'vuelidate';
 import Multiselect from 'vue-multiselect';
+import VueDOMPurifyHTML from 'vue-dompurify-html';
 import FluentIcon from 'shared/components/FluentIcon/DashboardIcon';
 
 import WootUiKit from '../app/javascript/dashboard/components';
 import i18n from '../app/javascript/dashboard/i18n';
+import { domPurifyConfig } from 'shared/helpers/HTMLSanitizer';
 
 import '../app/javascript/dashboard/assets/scss/storybook.scss';
 
@@ -15,6 +17,8 @@ Vue.use(VueI18n);
 Vue.use(Vuelidate);
 Vue.use(WootUiKit);
 Vue.use(Vuex);
+Vue.use(VueDOMPurifyHTML, domPurifyConfig);
+
 Vue.component('multiselect', Multiselect);
 Vue.component('fluent-icon', FluentIcon);