feat: button to scroll to the bottom of message list

- feat: show new messages in conversation count when user has scrolled to older messages
- feat: Events in conversation update automation rules
- feat: use prop vee-validate validations in `SelectTag` custom component and changes to enable use of vee-validate
- Adds new column events in automation rules
- Delete unlinked messages media files periodically.

cmd/main.go

@@ -151,6 +151,9 @@ func main() {
 	// Start notification service.
 	go notifier.Run(ctx)
 
+	// Delete media not linked to any message.
+	go media.DeleteUnlinkedMessageMedia(ctx)
+
 	// Init the app
 	var app = &App{
 		lo:           lo,