BaseLibraryTabState documented an abstract loadData() that every tab "must implement", but three of the four tabs override loadItems() entirely and carried never-invoked empty loadData stubs; only the recommended tab exercised the contract, so the class docs described an extension surface that did not exist.
loadItems() is now the one overridable hook, and the shared load transaction (generation tracking, localized error mapping, post-frame onDataLoaded) lives once in the protected runLoadTransaction helper that the recommended tab and the focus tests route through. No tab's load behavior changes.
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