Kyle Carberry 0a026fde39 refactor: remove reasoning title extraction from chat pipeline (#22926) ...

Removes the backend and frontend logic that extracted compact titles
from reasoning/thinking blocks. The `Title` field on `ChatMessagePart`
remains for other part types (e.g. source), but reasoning blocks no
longer have titles derived from first-line markdown bold text or
provider metadata summaries.

**Backend:**
- Remove `ReasoningTitleFromFirstLine`, `reasoningTitleFromContent`,
`reasoningSummaryTitle`, `compactReasoningSummaryTitle`, and
`reasoningSummaryHeadline` from chatprompt
- Simplify `marshalContentBlock` to plain `json.Marshal` (no title
injection)
- Remove title tracking maps and `setReasoningTitleFromText` from
chatloop stream processing
- Remove `reasoningStoredTitle` from db2sdk
- Remove related tests from db2sdk_test

**Frontend:**
- Remove `mergeThinkingTitles` from blockUtils
- Simplify `appendTextBlock` to always merge consecutive thinking blocks
- Remove `applyStreamThinkingTitle` from streamState
- Simplify reasoning/thinking stream handler to ignore title-only parts
- Update tests accordingly

Net: **-487 lines / +42 lines**

2026-03-11 11:01:26 +00:00

..

db2sdk_test.go

refactor: remove reasoning title extraction from chat pipeline (#22926)

2026-03-11 11:01:26 +00:00

db2sdk.go

refactor: remove reasoning title extraction from chat pipeline (#22926)

2026-03-11 11:01:26 +00:00