fix(ai): offer Retry when the failed turn persisted partial assistant output (#22478)

## 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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packages/twenty-front/src/modules/ai/components/AiChatLastMessageWithStreamingState.tsx

@@ -1,4 +1,5 @@
 import { AiChatMessage } from '@/ai/components/AiChatMessage';
+import { useRetryChatMessage } from '@/ai/hooks/useRetryChatMessage';
 import { agentChatDisplayedThreadState } from '@/ai/states/agentChatDisplayedThreadState';
 import { agentChatErrorComponentFamilyState } from '@/ai/states/agentChatErrorComponentFamilyState';
 import { agentChatIsStreamingComponentFamilyState } from '@/ai/states/agentChatIsStreamingComponentFamilyState';
@@ -9,6 +10,7 @@ import { useAtomStateValue } from '@/ui/utilities/state/jotai/hooks/useAtomState
 import { isDefined } from 'twenty-shared/utils';
 
 export const AiChatLastMessageWithStreamingState = () => {
+  const { retryChatMessage } = useRetryChatMessage();
   const lastMessageId = useAtomComponentSelectorValue(
     agentChatLastMessageIdComponentSelector,
   );
@@ -34,6 +36,7 @@ export const AiChatLastMessageWithStreamingState = () => {
       messageId={lastMessageId}
       isLastMessageStreaming={agentChatIsStreaming}
       error={agentChatError ?? undefined}
+      onRetry={retryChatMessage}
     />
   );
 };

packages/twenty-front/src/modules/ai/components/AiChatMessage.tsx

@@ -144,12 +144,14 @@ type AiChatMessageProps = {
   messageId: string;
   isLastMessageStreaming?: boolean;
   error?: AiChatError | undefined;
+  onRetry?: () => void;
 };
 
 export const AiChatMessage = ({
   messageId,
   isLastMessageStreaming = false,
   error,
+  onRetry,
 }: AiChatMessageProps) => {
   const agentChatMessage = useAtomComponentFamilySelectorValue(
     agentChatMessageComponentFamilySelector,
@@ -187,7 +189,7 @@ export const AiChatMessage = ({
           </StyledFilesContainer>
         )}
         {shouldShowError && isDefined(error) && (
-          <AiChatErrorRenderer error={error} />
+          <AiChatErrorRenderer error={error} onRetry={onRetry} />
         )}
       </StyledMessageContainer>
       {agentChatMessage.parts.length > 0 && (