Release v0.4.1

Release v0.4.0 (Stable CI)

fix(install): correct macOS paths and shell detection

Patches the installer to correctly identify Zsh vs Bash based on user login shell rather than script execution shell. Also fixes the 'Read-only file system' error by defining HOOK_FILE after DATA_DIR is set. Bumps version to 0.3.1.

fix(install): use native Application Support path on macOS