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Adds an optional "update available" indicator to the web dashboard.
Added
centauri server --check-updates(off by default). When enabled, the server does one cached PyPI lookup every 12 h and the dashboard shows a subtle ↑ vX.Y.Z badge next to the version when a newer release exists, linking to its notes.- Fail-silent, and the only outbound (non-printer) call in the whole tool — so the default still "talks only to your printer."
/api/infogainslatest_version+update_available(inert unless opted in). PEP 440 comparison, so a local dev build ahead of PyPI never false-nags.
No new dependencies.