[help wanted] PTY terminal — auto-detect default shell on Linux/macOS

[GoDiao]

Background

The built-in PTY terminal currently defaults to PowerShell on Windows and gives Linux/macOS users a less-tuned experience. We want the terminal to:

1. Auto-detect the user's preferred shell ($SHELL, /etc/passwd, or platform default)
2. Support zsh / bash / fish explicitly on macOS and Linux
3. Let the user override the default in Settings

Tasks

• Read $SHELL and fall back to /bin/bash (Linux) or /bin/zsh (macOS Catalina+)
• Wire the chosen shell through to the portable-pty spawn in desktop/src-tauri/
• Add a Default shell dropdown in Settings → General
• Persist the choice to the existing config store
• Add a vitest unit test for the detection helper

Files

• desktop/src-tauri/ (PTY module)
• desktop/src/components/settings/General*
• desktop/src/stores/ (config slice)

Difficulty / Estimate

⭐⭐ — half a day to a full day if you're new to Tauri.

Mentor

Maintainer can pair on the Rust side if needed.