fix(tui): short-circuit wizard.Run on cancelled context before opening TTY

internal/tui/wizard/wizard.go

@@ -17,6 +17,11 @@ import (
 func Run(ctx context.Context, reg *module.Registry, initial tui.WizardState) (tui.WizardState, bool, error) {
 	s := initial
 
+	// Honour an already-cancelled context before Huh tries to open /dev/tty.
+	if err := ctx.Err(); err != nil {
+		return s, false, nil
+	}
+
 	themeOptions := make([]huh.Option[string], 0, len(tui.BuiltinThemes))
 	for _, t := range tui.BuiltinThemes {
 		themeOptions = append(themeOptions, huh.NewOption(t.Name, t.ID))