feat(zsh): display named directories

[LunarLambda]

Pass Zsh's %~ prompt specifier to --logical-path in PROMPT/RPROMPT

Description

Display the current directory using zsh's %~ specifier, which shortens paths if they refer to a named directory.

Motivation and Context

Named directories are a great feature of zsh and most common zsh prompts use the %~ specifier to display the current directory in shortened form when possible.

Screenshots (if appropriate):

Before (With directory.truncate_to_repo = false for emphasis)

After (named directory set with hash -d nvim=~/cfg/nvim)

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

Unsure what testing/documentation this needs, since it's just passing an existing flag to starship prompt. I would be happy to make any necessary adjustments.

However, I did notice that passing --logical-path overrides directory.truncate_to_repo completely, I'm not sure if that's intentional/desired.

[LunarLambda]

Alternatively, here's a hack-ish way to do it with starship init zsh:

source <(starship init zsh | sed "/^R\?PROMPT=/s/)'$/ --logical-path \"\${(%):-%~}\"&/")