fix: open native directory picker for new instances

cmd/chub/main.go

@@ -14,6 +14,7 @@ import (
 	"chub/internal/domain"
 	"chub/internal/platform/browser"
 	"chub/internal/platform/config"
+	"chub/internal/platform/files"
 	"chub/internal/platform/logging"
 	"chub/internal/ui"
 	"gioui.org/app"
@@ -102,6 +103,8 @@ func runWindow(logger *slog.Logger) {
 	window.Option(app.Title("Chub"), app.Size(unit.Dp(1100), unit.Dp(720)))
 	theme := material.NewTheme()
 	shell := ui.NewShell(theme)
+	directoryPicker := files.NewDirectoryPicker()
+	shell.OnChooseDirectory(directoryPicker.ChooseDirectory, window.Invalidate)
 	discoverer := browser.NewDiscoverer()
 	shell.OnPathSearch(func(ctx context.Context, field ui.PathField, current string) (string, error) {
 		switch field {