Increase delay for autoExpandFolders and enable it by default

autoExpandFolders (Settings >> Navigation >> Open Folders During Drag Operations) is a helpful feature that allows you to drag a file/folder and quickly enter/navigate through other folders by hovering over them for a while. Unfortunately, it's disabled by default and hidden under Navigation settings, making it very undiscoverable.

I suppose it wasn't enabled by default because it would be easy to accidentally enter a folder while trying to move a file. That can be mitigated by increasing the delay for entering a folder after hovering over it, meaning that now it should be safe to have it enabled by default.

I feel like the new value is a good balance between speed and safety against accidental operations. It gives the user enough time to drop the file if they want to see the file operations context menu (even if they have poor mouse skills), while still being quick enough not to slow down navigation. Additional testing would be appreciated.

I'm tagging @teams/vdg since this is a behavioral change.