Fix story preview bugs, and bugs of data Resolution for query ids

[ad4mou]

Summary

• Charts and tables in the story preview now find their data while the agent is still writing, instead of showing "data unavailable" until it finishes.
• Older versions of a story now load their own data, so their charts render correctly even after the agent has made new queries.
• Cancelling the agent mid-write no longer leaves the unfinished text stuck in the panel, hiding every saved version behind it.
• The preview stops dragging you to the bottom while the agent writes. It follows along only if you're already at the bottom, and stays put once you scroll up.
• Long stories no longer lag and then dump everything at once — the preview does far less repeated work while streaming.
• Restoring an older version now takes you straight to the new version instead of leaving you to click forward through the arrows.

Behavior note

Text-only edits don't show a live preview. The panel keeps the last saved version with an "Updating..." indicator until the edit lands. Streaming those edits meant redrawing the whole document per token, which caused huge lags and small text edits are a rare ask so I chose not to do this feature.

Closes #1426

[github-actions]

🚀 Preview Deployment

URL	https://pr-1425-a2d65f2.preview.getnao.io
Commit	a2d65f2

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

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_{Preview will be automatically removed when this PR is closed.}

[cubic-dev-ai]

All reported issues were addressed across 24 files

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[cubic-dev-ai]

All reported issues were addressed across 4 files (changes from recent commits).

<sub>Reply with feedback, questions, or to request a fix.

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