F1: clear the "Reindex now" spinner once the poll cap fires. Gate the
reindexing part of the button's loading state on the active poll window
(reindexDeadline !== null) so a run that outlives the 120s cap no longer
leaves the button stuck-disabled with a stale `reindexing: true`; the
admin can restart.
F2: rewrite reindexWorkspace JSDoc to describe the EMBEDDABLE page set
(text OR existing embeddings), matching getEmbeddablePageIds /
countEmbeddablePages instead of the old "every non-deleted page".
F3: extract the shared embeddable-content predicate into a private
PageRepo.embeddablePredicate helper, called by both countEmbeddablePages
and getEmbeddablePageIds, removing the verbatim duplication. Behavior is
identical (lockstep int-spec stays green).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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