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J-2a.II Current topic title in affixed board nav

Description

J-2a.II Current topic title in affixed board nav

As you scroll, finds the topic currently in view,
and renders its topic title in place of "browse topics"

Fixes T76588

Bug: T76588
Change-Id: I4a9b24a9ab5bf9c4a585a8e8687197d6ee10a739