Improve support for standard MacOS keyboard shortcuts

Is your feature request related to a problem? Please describe.
Keyboard navigation does not work as expected on MacOS. It'd be a really big QoL improvement to be able to use Cmd+Up/Down to traverse a directory structure as I can in Finder. Additionally, the standard keyboard shortcut to select all text, Cmd+A, does not work on text inputs in the app.

Describe the solution you'd like
Better adherence throughout the app to standard MacOS keyboard conventions. A few specific examples:

• Cmd+, should open the settings tab
• Cmd+Left/Right should go back and forward instead of Alt+Left/Right. If focused on a text input, Alt+Left/Right should instead be bound to moving between words as normal in a MacOS text input
• Cmd+Up/Down should open a child directory and open the parent directory respectively as in Finder or Cyberduck
• (Nice to have) Enter should open the rename dialog instead of opening the directory

Additional context
See https://support.apple.com/en-gb/HT201236

No files, tests, or entry points are named. Start by locating the app's existing keyboard shortcut and text-input handling, then compare the MacOS behavior against the listed shortcuts; done means the specified shortcuts work consistently, including Cmd+A in text inputs.