## Rationale
When a turn fails mid-stream *after* emitting some text, the failed
turn's partial assistant message is persisted — so the last message in
the thread is the assistant's, and `AiChatErrorUnderMessageList` (which
owns the Retry button, gated on the last message being the user's) never
renders. The error surfaces through `AiChatMessage` →
`AiChatErrorRenderer` instead, and that path never passed `onRetry`.
Result: an error banner with no action for the most common failure shape
(mid-stream provider errors), most visibly after a reload.
## Why this is the root cause, not a symptom patch
This is a wiring omission, not a designed gate. `AiChatErrorRenderer`
already accepts `onRetry`, and the server's `retryLastFailedTurn`
already deletes the failed turn's assistant messages before re-streaming
— the entire retry path for partial-output turns exists and works; only
the prop was never threaded. Verified there's no hidden protective
reason: retrying with partial output cannot duplicate content, because
regeneration is delete-then-restream by design.
## User impact
A mid-stream failure currently strands the user: their only options are
re-typing the message or reloading. With this, the same Retry affordance
appears whether the turn died before or after the first token (Sentry
shows 126 users/30d hitting zero-output failures alone — the with-output
shape shares the same recovery need).
## Test plan
- [x] `AiChatErrorRenderer` retry behavior already covered by existing
rendering; change is prop threading only (~10 lines)
- [ ] CI green
- [ ] Manual: fail a turn mid-stream (kill provider), observe Retry on
the in-message error banner
https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38
---
_Generated by [Claude
Code](https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38)_
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Félix Malfait
a445974cff
