TUI: Feature request - Specify output location for attachment exports

[larray]

Currently if exporting an attachment, it appears to default to the data_dir (CONFIG.toml), MSGVAULT_HOME directory, or ~/.msgvault without any other configuration.

Suggestions:

• Without any other configuration settings - place exports in an /export folder (similar to analytics, attachments, deletions, tokens)

It appears to export a .zip in the root directory of the data directory with the form "subject title_messageID?.zip"
Is that the message ID?

• Provide a facility to place exports in an alternate location (config option like export_dir)
• Provide the option at TUI export to change location (may be an extravagant ask for the TUI)

I'm thinking some form of contextual output may be nice as well:
Year
Month
Day

Or if from a subject or sender context when exporting
Sender
Subject

I could see on a mass export where an entire root directory would be littered with contextless files. (Unless multiple exports end up in a ZIP related to the explicit export request, I haven't tested that yet).