fix: chunks sometimes not visibles, bc useEffect missing dependencies

[vanbasten17]

Context

Chunks from AI Agent debug events were sometimes not visible in the preview (Ralph Lauren / v1 bots).

Root cause

• When a Pusher payload exceeds 10 KB, the backend sends a truncated stub (tools_executed: [], truncated: true) and the frontend rehydrates it via getMessageById.
• useKnowledgeBaseInfo had an empty dependency array ([]) on its fetching useEffect, so it ran once on mount with chunkIds = [] and never re-ran when rehydration later populated the real chunk IDs → chunks were never fetched.

Fix

• Added chunkIds to the useEffect dependency array in use-knowledge-base-info.tsx so the fetch re-triggers once rehydration replaces the empty tools_executed with the real data.
• Added a regression test verifying getChunkIdsGroupedBySource is called with the real chunk IDs after getMessageById rehydrates a truncated event.

[chatgpt-codex-connector]

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