You've implemented "select 50 messages and perform bulk actions". Congrats!
Now we need the same thing available for all messages. We do not want to have to build AI agents to select and delete 50 message at a time. We want to be able to delete them all in one go from the Web client, like on other platforms.
I've seen this implemented as a 2 step action, select 50, then a checkbox shows up to allow the user to select all messages if they want to.