Add hotkeys for navigating up and down on the sidebar file explorer

Use case or problem

When focusing the sidebar (via “Reveal active file in file explorer” hotkey), you are able to navigate up and down, using the up and down keys on your keyboard. I would really like to remap these, as they are hard to reach when my hands are resting naturally at the normal “asdf” row.

Proposed solution

Add 2 new hotkeys:

  • “Navigate sidebar up” moves the sidebar cursor up one row
  • “Navigate sidebar down” move the sidebar cursor down one row

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