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

package.json

@@ -18,8 +18,7 @@
     "prepare": "husky install",
     "size": "size-limit"
   },
-  "size-limit": [
-    {
+  "size-limit": [{
       "path": "public/packs/js/widget-*.js",
       "limit": "270 KB"
     },
@@ -108,6 +107,7 @@
     "@storybook/addon-docs": "^6.5.9",
     "@storybook/addon-essentials": "6.5.9",
     "@storybook/addon-links": "6.5.9",
+    "@storybook/addon-postcss": "^2.0.0",
     "@storybook/addons": "6.5.9",
     "@storybook/vue": "6.5.9",
     "@types/jest": "^29.5.2",