Option to use background highlight as cursor instead of > arrow

[User98321]

The current cursor indicator is a > arrow prepended to the filename. It would be great to have an option to use a background highlight (full-row) instead, or something else to make selection more intuitive, because it may be not visible to people with certain eyes condition. Also this would look cleaner and make the focused file more visually obvious.

A config option like cursor_style = "arrow" (default, current behavior) or cursor_style = "highlight" which renders the current row with a different background color instead of showing >.

Alternative considerations:
Changing the > to another character via theme (not currently supported either)

[github-actions]

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