feat(user): a drawer page for the user's details

Name, email, avatar, language, location and the git signing key, each
saved through userctl to every store that holds it. Only changed fields
are sent; a field whose write failed keeps its edit and its error, so
the next Save retries it.

A failed userctl get reports a single error= line. The page shows it in
red under the avatar, leaves saved and draft untouched, and disables
Save until a later load succeeds.

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

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