## Summary
Fixes#2856 - The `onComplete` callback in `useRealtimeRun` was firing prematurely
## Root Cause
The callback was triggered when the long-poll stream ended, regardless
of whether the run had actually completed. Reverse proxies often close
idle connections, causing the stream to end prematurely. In this case it
was caused by fetch abort due to React strict mode.
## Fix
Changed the condition from checking if `run` exists to checking if
`run?.finishedAt` exists, ensuring `onComplete` only fires when the run
has reached a terminal state.
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Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: nicktrn <nicktrn@users.noreply.github.com>
nicktrn
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