Add option to choose local disk path using the native OS file explorer

When configuring a local disk in rclone view, users currently need to use the native explorer or copy and past the path.

Suggested behavior:

  • Add a “Browse…” button next to the path field

  • Clicking it opens the native OS folder picker dialog

  • After selecting a folder, the path is automatically filled

Benefits:

  • Easier for beginners

  • Reduces typing mistakes

  • Faster configuration for local storage

  • Consistent with many desktop applications