fix: enable browser executable selection

internal/platform/files/executable_picker_windows.go

@@ -0,0 +1,54 @@
+//go:build windows
+
+package files
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+type windowsExecutablePicker struct{ runner commandRunner }
+
+func NewExecutablePicker() ExecutablePicker { return windowsExecutablePicker{runner: execRunner{}} }
+
+func newExecutablePickerWithRunner(runner commandRunner) windowsExecutablePicker {
+	return windowsExecutablePicker{runner: runner}
+}
+
+func (p windowsExecutablePicker) ChooseExecutable(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", executableDialogScript)
+	if err != nil {
+		if ctxErr := ctx.Err(); ctxErr != nil {
+			return "", ctxErr
+		}
+		return "", fmt.Errorf("open executable picker: %w", err)
+	}
+	selected := strings.TrimSpace(string(output))
+	if selected == "" {
+		return "", ErrSelectionCanceled
+	}
+	if !filepath.IsAbs(selected) {
+		return "", fmt.Errorf("executable picker returned a non-absolute path")
+	}
+	if !strings.EqualFold(filepath.Ext(selected), ".exe") {
+		return "", fmt.Errorf("executable picker returned a non-executable path")
+	}
+	return filepath.Clean(selected), nil
+}
+
+const executableDialogScript = `[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new($false)
+Add-Type -AssemblyName System.Windows.Forms
+$dialog = New-Object System.Windows.Forms.OpenFileDialog
+$dialog.Title = '选择 Chrome 或 Edge 可执行文件'
+$dialog.Filter = '浏览器可执行文件 (*.exe)|*.exe|所有文件 (*.*)|*.*'
+$dialog.CheckFileExists = $true
+$dialog.Multiselect = $false
+if ($dialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
+  [Console]::Out.Write($dialog.FileName)
+}`