## Problem
When an AI chat conversation is reloaded from the DB (page refresh or
initial load), message parts are returned without guaranteed ordering.
The renderer groups reasoning/thinking steps only when they are
**contiguous** — so if `reasoning` parts land after the `text` part,
thinking blocks appear below the final answer, and can appear duplicated
or split.
This only surfaces with reasoning models (OpenRouter, etc.) because
those produce multiple reasoning/tool/text parts per message, making
ordering observable. Simple text-only messages aren't affected.
## Root cause
`AgentChatService.getMessagesForThread()` fetches `parts` via a TypeORM
relation with no ORDER BY on `orderIndex`. The DB can return parts in
any order.
`mapDBMessagesToUIMessages()` then calls `dbMessage.parts.map(...)`
directly, without sorting.
A parallel server-side utility (`mapDBPartsToUIMessageParts.ts`) already
sorts by `orderIndex` — this fix makes the frontend fetch path
consistent with it.
## Fix
Sort parts by `orderIndex` before mapping to UI parts in
`mapDBMessagesToUIMessages.ts`.
```ts
parts: [...dbMessage.parts]
.sort((a, b) => a.orderIndex - b.orderIndex)
.map(mapDBPartToUIMessagePart),
```
`orderIndex` is already included in `GetChatMessagesDocument` — no
schema or query changes needed.
## Test
1. Open Ask AI with a reasoning model (e.g. via OpenRouter).
2. Run a prompt that produces thinking steps.
3. Hard-refresh the page.
4. Thinking blocks should appear collapsed above the final answer, not
below it.
Closes#22386
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Thomas Trompette
35d3f9b89d
