Add `wt` function to launch Windows Terminal with WSL in current directory across Bash, Fish, Nushell, and PowerShell. The function supports passing additional arguments while maintaining the current working directory context.
Remove the custom `bw_login` function/alias from Nushell, bash, and PowerShell configurations as it's no longer needed. Expand PowerShell profile with comprehensive git aliases matching bash conventions, add clipboard navigation helper (`cdp`), and enable chezmoi completions.