Feature: Live View

`diskonaut` does not re-scan the hard-drive once it is done. If the files change, it does not know about it.

It would be cool if it could listen to the folders it scanned for changes and update itself. Whatever method we choose to implement it, let's make sure not to take up too many resources (CPU mostly) on the host machine.

No files, tests, or entry points are named. Start by locating the hard-drive scanning and terminal refresh paths, then determine how folder changes can trigger updates without excessive CPU use; done means the view reflects changes while monitoring remains resource-efficient.

Written by the indexing model from the issue text.