feat: add Windows Terminal helper function across all shells

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.

home/.chezmoitemplates/nushell/config.nu.tmpl

@@ -1044,4 +1044,15 @@ def maestroOn [] {
     bluetoothctl unblock "AC:BF:71:66:FE:B2"
     bluetoothctl connect "AC:BF:71:66:FE:B2"
 }
-{{ end }}
+{{ end }}
+
+{{- if .wsl }}
+# Launch Windows Terminal in current directory
+def wt [...args: string] {
+    if ($args | is-empty) {
+        ^wt.exe -w 0 sp wsl --cd (pwd)
+    } else {
+        ^wt.exe -w 0 ...$args wsl --cd (pwd)
+    }
+}
+{{- end }}