Update downloader_menu.dart

[s-b-repo]

fixes:

1.Added _currentPath state variable to safely store the path for display
2.Added null/empty check before setting Directory.current in initState
3.Added Directory(pref).existsSync() check to verify path exists
4.Use _currentPath in the button text instead of Directory.current.path
5.Save folder directly instead of Directory.current.path after setting****

[s-b-repo]

fixes:

1.Wrapped getIcons() in try-catch to handle AssetManifest.json load failures gracefully
2.Added await to getIcons() call for proper async error handling
3.Added try-catch around PackageInfo.fromPlatform() (can also fail with sudo)
4.Uses debugPrint for warnings instead of crashing