refactor(archsetup): break dotfile-restore chain into guarded steps

The previous block ran three operations under one error_warn: `cd "$dotfiles_dir" && git config --global --add safe.directory ... && git restore .`. If any one of them failed, the operator saw a single "restoring dotfile versions" warning with no clue which step broke. The cd was unnecessary because git's `-C` flag does the same thing without changing the calling shell's working directory.

I split the block into two guarded steps. The `safe.directory` config runs first with its own error_warn. If that step succeeds, the `git restore` runs next with its own error_warn. If `safe.directory` fails, the dotfile restore is skipped entirely. The original cause gets logged once instead of cascading into a second error from git's dubious-ownership check. I also dropped the `cd` and used `git -C "$dotfiles_dir"` instead.

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