feat(git): add keys per section with a + beside each heading

The single Add line at the bottom took a full section.key and left the
user to type the section right. Each heading now carries a + that opens a
key and value row under it; git config --add writes the key into that
existing section, among its neighbours, rather than at the end of the
file. The typed text lives on the page, not in the fields, so a failed add
keeps it across the reload that rebuilds every row. A new section is made
in the editor.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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