Is there a plan to add a dasboard or some sort of overview app/module?

ERPNext
1

Most ERP systems have an overview option… best if this is build using widgets so it would be easily customizable.
Reason is that if a member/admin of company logs in he can get a quick overview of the business - unpaid invoices, out of stock items, over production and other bottlenecks in the process etc.

2

Maybe this is of interest?

3

That is what notifications are for:

You can add it to GitHub Issues as a feature request though