[paveg]

Summary

• Add XDG Base Directory fallback exports at top of .zshrc to handle cases where .zshenv is not sourced first
• Disable ZDOTDIR in .zshenv to keep .zshrc at ~/.zshrc for simplicity

Problem

When .zshenv is not sourced before .zshrc, XDG variables would be empty, causing paths like ${XDG_CACHE_HOME}/devbox to resolve to just /devbox, resulting in permission denied errors:

mkdir: cannot create directory '/devbox': Permission denied
mkdir: cannot create directory '/zinit': Permission denied
mkdir: cannot create directory '/zsh': Permission denied

Test plan

• Run chezmoi apply on a fresh system
• Verify no permission errors on shell startup
• Verify zinit, devbox, and starship initialize correctly

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