fix(desktop): skip WindowsApps bash when resolving Git Bash

[Chessing234]

Summary

• PATH often puts %LOCALAPPDATA%\Microsoft\WindowsApps\bash.exe (WSL launcher) ahead of Git Bash
• that stub opens visible terminals and hangs provider discovery / ACP installs
• skip the WindowsApps dir during bash PATH scans so Git Bash wins

Closes #2328

Test plan

• windows unit test test_skips_windowsapps_bash_prefers_git_bash
• on Win11 with both WindowsApps bash and Git Bash: confirm Buzz no longer spawns WSL terminals during navigation / onboarding

Made with Cursor

[Chessing234]

bash resolution now skips the windowsapps wsl stub and falls through to git bash.

[tzarebczan]

I have this fixed in #2247 also, someone brought it up in my PR.