[Feature] Download all chats at once (as single MD files)

[byebb]

Feature description

It would be nice to have a button similar to the MD download at the bottom of the chat to download all chats stored in the account.

Motivation

Backup files locally.

Alternatives

In addition, a nice search that allows searching through all chats immediately in the app would be really helpful.

Additional context

There is another Chrome Extension that does sth. similar:

But still only for single chats not for the complete history. Currently a user needs to load every single chat and download the content manually, which is really unnecessarily time consuming.