fix(story): invalidate getLatest when agent run completes

[nehaaprasaad]

fix : #736

summary

• Fixes story preview showing “Table data unavailable” after the assistant updates a story, plus small related fixes.

Changes

• Invalidate story.getLatest when the agent run ends so queryData matches new table queryIds.
• Parse API errors in chat UI as strings so nested OpenAI error objects do not crash React.
• Use env API key / base URL when project LLM config stores an empty key (fallback for “use env” rows).

How to verify

• Agent edits a story table → preview shows data without a full page reload.
• Lint passes (npm run lint).

[github-actions]

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[github-actions]

🚀 Preview Deployment

URL	https://pr-738-a5839b1.preview.getnao.io
Commit	a5839b1

⚠️ No LLM API keys configured - you'll see the API key setup flow when trying to chat.

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