Feature request: Configurable terminal shell on Windows

The terminal panel in Claude Code for Windows is hardcoded to launch C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe (PowerShell 5.1). There is no way to override this via settings.json or any other config — PATH manipulation does not work because the full path is hardcoded in the app bundle.

Please add a terminalShell setting (or similar) to settings.json so users can point it at pwsh.exe (PowerShell 7) or any other shell.