Make non-singleton editors to return project paths by adding a `fn
active_project_path`: this had been added as `fn project_path` and
similar already, so the PR replaced those methods with the generic one
now.

Before:


https://github.com/user-attachments/assets/d0773e18-3910-4c5b-bcb3-a742f9bf9691


After:


https://github.com/user-attachments/assets/e7a3f13e-9649-4564-a7e6-dccf54f8c000


Release Notes:

- Made project panel to auto reveal multi buffer excerpts with latest
selection