Lazygit runs git directly rather than through a shell, so a literal "~"
reaches `git worktree add` unexpanded and git creates a directory named
"~" instead of using the home directory.
Expand the tilde ourselves, both for paths typed into the "Other"
location prompt and for the worktree.defaultPath config value.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
