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Felipe Coury c6ffe9abab fix(tui): avoid duplicate live reasoning summaries (#15758 )

## TL;DR

Fix duplicated reasoning summaries in `tui_app_server`.

<img width="1716" height="912" alt="image"
src="https://github.com/user-attachments/assets/6362f25a-ab1c-4a01-bf10-b5616c9428c2"
/>

During live turns, reasoning text is already rendered incrementally from
`ReasoningSummaryTextDelta`. When the same reasoning item later arrives
via `ItemCompleted`, we should only finalize the reasoning block, not
render the same summary again.

## What changed

- only replay rendered reasoning summaries from completed
`ThreadItem::Reasoning` items
- kept live completed reasoning items as finalize-only
- added a regression test covering the live streaming + completion path

## Why

Without this, the first reasoning summary often appears twice in the
transcript when `model_reasoning_summary = "detailed"` and
`features.tui_app_server = true`.

2026-03-25 10:14:39 -06:00