[enhancement] Straightforward way to reset Positron back to its original, all-default state (for panes and displays)

[rodrigosf672]

System details:

Positron and OS details:

Positron Version: 2025.10.0 build 8
Code - OSS Version: 1.103.0
Commit: bd924d6e5e6e9aa6326060f9bba40c32c9140ffa
Date: 2025-08-29T07:10:17.441Z
Electron: 37.2.3
Chromium: 138.0.7204.100
Node.js: 22.17.0
V8: 13.8.500258-electron.0
OS: Darwin arm64 24.6.0

Describe the issue:

After user has used Positron for a while, they may want to return it back to a default/blank state, especially after making lots of modifications to pane locations and to displays. I had trouble finding an easy, straightfoward way to bring Positron back into a default state.

Steps to reproduce the issue:

1. Make changes to pane locations in Positron. If you want, also make changes to modes and bar locations.
2. If you want to send things back to how they were when you first opened Positron, it's cumbersome.

Expected or desired behavior:

Easy way to reset Positron back into a "tabula rasa" state, while preventing accidental resets.

[rodrigosf672]

@testlabauto Not sure what you think of this... maybe there is an easy way somewhere, but I logged it just in case for triage.

[jennybc]

I think this is a duplicate of #8993?