Improve snapshot browser

[MagicalDrizzle]

Note: if you have a question or want discussion please post in the discussions area.

Is your feature request related to a problem? Please describe. The current snapshot browser is clunky, and doesn't work well when you need to restore a deeply nested folder (not only do you need a lot of time to navigate there because each time you open a folder there's a delay, but the display itself is very short horizontally, so you can't see the folder/filenames past a certain nested folder count)

Describe the solution you'd like Maybe expand the snapshot browser display horizontally? And maybe cache the directory structure so there's no delay when you open a folder.
A more radical idea would be to implement a "file manager-style" snapshot browser instead of expanding folders with arrows.

Additional context Add any other context or screenshots about the feature request here.

[sikhness]

It would be nice to also be able to delete files inside of snapshots and/or all snapshots via the browser facilitated by using the restic rewrite command in the backend.