Fix citation focus positioning

[suguanYang]

Summary

• Re-apply the focused citation chunk scroll reset on the next animation frame so TanStack Virtual/browser layout measurement cannot leave the viewport offset below the focused chunk.
• Add a regression test that simulates a tall focused table chunk being moved to row 0, then a post-layout scroll adjustment that must be reset back to the start.

Verification

• pnpm test src/components/chunks-panel.test.ts -- --runInBand
• pnpm test
• pnpm exec tsc --noEmit
• pnpm lint
• pnpm build
• git diff --check
• Browser sanity check on http://localhost:3027: guest chunks render with measured row heights and no table-row overlap after reload.

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Project	Deployment	Actions	Updated (UTC)
knowhere-notebook-staging	Ready	Preview, Comment	May 10, 2026 9:18am