Make zsh-quickstart-kit ZDOTDIR-aware and nounset-resilient\n\n- Use ${ZDOTDIR:-/Users/s-a-c} for config paths\n- Guard unset vars with ${VAR-}/${VAR:-default}/(( ${+VAR} ))\n- Preserve behavior when ZDOTDIR unset

Signed-off-by: StandAloneComplex <[email protected]>

Author: s-a-c