Make database path configurable and show and error if it can't be found

[Cadair]

Hi,

I just started testing out CloudLogOffline, and it wasn't working until I created the ~/Documents directory. So it would be nice if that path was configurable, or it made the parent directory and/or it threw you a warning in the UI if the db was broken / non-existent.

Thanks for the project.

[dg0yt]

On which type of system did this issue occur?

The app uses what Qt assumes to be the writable standard location for documents (QStandardPaths::DocumentsLocation).
TBH I wonder if it could use QStandardPaths::AppDataLocation instead.
https://doc.qt.io/qt-6/qstandardpaths.html#StandardLocation-enum

[Cadair]

linux (nixos)

Defaulting to AppData would probably be better, although I would still like a config method.