Apply Mentions everywhere (#595)

* variables and mentions

* fix lint

* add missing changes

* fix tests

* update quilly, fix bugs

* fix lint

* apply fixes

* apply fixes

* Fix MentionParser

* Apply Mentions everywhere

* Fix MentionParserTest

* Small refactoring

* Fixing quill import issues

* Polished email integration, added customer sender mail

* Add missing changes

* improve migration command

---------

Co-authored-by: Frank <csskfaves@gmail.com>
Co-authored-by: Julien Nahum <julien@nahum.net>

client/components/pages/pricing/SubscriptionModal.vue

@@ -4,6 +4,7 @@
     compact-header
     max-width="screen-lg"
     backdrop-blur
+    class="z-50"
     @close="subscriptionModalStore.closeModal()"
   >
     <div class="overflow-hidden">