stacklok / toolhive-studio / 25736855761 / 1

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fix(playground): re-hydrate chat thread after stream-recovery refetch (#2232)

When the hydration effect drops the trailing assistant on a peek that
sees an active stream but the stream finishes before `resumeStream()`
returns, the recovery path invalidates the thread query. The refetch
updates `threadData` and re-runs the effect — but the `hydratedThreadRef`
guard short-circuits, so `setMessages` never replays the finalized
snapshot and the UI is left missing the final assistant turn until
reload. Clear the ref before invalidating so the next effect pass is
allowed to re-hydrate.

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