feat: Improve email rendering, introduce a new layout for emails (#5039)

Co-authored-by: Fayaz Ahmed <15716057+fayazara@users.noreply.github.com>

app/javascript/dashboard/constants.js

@@ -12,6 +12,10 @@ export default {
     SNOOZED: 'snoozed',
     ALL: 'all',
   },
+  LAYOUT_TYPES: {
+    CONDENSED: 'condensed',
+    EXPANDED: 'expanded',
+  },
   DOCS_URL: '//www.chatwoot.com/docs/product/',
 };
 export const DEFAULT_REDIRECT_URL = '/app/';