The desktop package.json carries a 0.0.0 placeholder on main (real versions come from channel builds and the live backend), but two About paths repeated it verbatim: appVersionInfo fell back to packageVersion when no display version was baked, and the native panel was seeded - and could be refreshed - with an empty applicationVersion, which macOS renders as the bundle's 0.0.0. Skip placeholder values ('', 0.0.0, unknown) across every candidate, and map the native panel string through nativeAboutVersion so unknown becomes an explicit label (backend spelling git.<short>[.dirty]) instead of 0.0.0. The renderer keeps its ''-means-unavailable contract. Closes#124581.
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