Most recently used and bookmarks?

Love what you're doing with broot!

Couple of related feature requests:

1. bookmarks. Bookmarked locations might be listed at the top when you first `br` and easily selectable. Reason: I frequently need to jump to certain dirs which might be quite nested and hard to reach by fuzzy search.
2. MRU - most recently used dirs - maybe the last 10 you `Alt-Enter`ed into? This would be kinda auto bookmarks

These lists could be combined.

Apols if this exists and I've not found this feature. Many thanks.

Start by reviewing broot's existing directory navigation and the behavior triggered by Alt-Enter. Determine how bookmarks and recently used directories should be stored, displayed, selected, and combined, then define acceptance criteria for persistence, ordering, and the initial `br` view.

Written by the indexing model from the issue text.