fix: open native directory picker for new instances

internal/platform/files/directory_picker_windows.go

@@ -0,0 +1,62 @@
+//go:build windows
+
+package files
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+var ErrSelectionCanceled = context.Canceled
+
+type commandRunner interface {
+	Run(context.Context, string, ...string) ([]byte, error)
+}
+
+type execRunner struct{}
+
+func (execRunner) Run(ctx context.Context, name string, args ...string) ([]byte, error) {
+	return exec.CommandContext(ctx, name, args...).Output()
+}
+
+type windowsDirectoryPicker struct{ runner commandRunner }
+
+func NewDirectoryPicker() DirectoryPicker { return windowsDirectoryPicker{runner: execRunner{}} }
+
+func newDirectoryPickerWithRunner(runner commandRunner) windowsDirectoryPicker {
+	return windowsDirectoryPicker{runner: runner}
+}
+
+func (p windowsDirectoryPicker) ChooseDirectory(ctx context.Context) (string, error) {
+	if err := ctx.Err(); err != nil {
+		return "", err
+	}
+	output, err := p.runner.Run(ctx, "powershell.exe",
+		"-NoProfile", "-NonInteractive", "-STA", "-WindowStyle", "Hidden", "-Command", folderDialogScript)
+	if err != nil {
+		if ctxErr := ctx.Err(); ctxErr != nil {
+			return "", ctxErr
+		}
+		return "", fmt.Errorf("open directory picker: %w", err)
+	}
+	selected := strings.TrimSpace(string(output))
+	if selected == "" {
+		return "", ErrSelectionCanceled
+	}
+	if !filepath.IsAbs(selected) {
+		return "", fmt.Errorf("directory picker returned a non-absolute path")
+	}
+	return filepath.Clean(selected), nil
+}
+
+const folderDialogScript = `[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new($false)
+Add-Type -AssemblyName System.Windows.Forms
+$dialog = New-Object System.Windows.Forms.FolderBrowserDialog
+$dialog.Description = '选择浏览器 User Data Dir'
+$dialog.ShowNewFolderButton = $true
+if ($dialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
+  [Console]::Out.Write($dialog.SelectedPath)
+}`