fix(virtual-core): smooth scrolling for dynamic item sizes

[piecyk]

🎯 Changes

This PR enables reliable smooth scrolling in dynamic lists.

Nagranie.z.ekranu.2026-01-4.o.23.10.57.mov

Limitations

This approach assumes a virtualization strategy where the list is moved as a whole (for example via a single positional offset/translate, or by using before/after spacers).

Virtualization strategies that reposition individual items during scrolling may still show visible jitter or misalignment when smooth scrolling is combined with dynamic size updates, since item measurements are intentionally deferred while smooth scrolling is in progress.

✅ Checklist

• I have followed the steps in the Contributing guide.
• x ] I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: 006a60c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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☁️ Nx Cloud last updated this comment at 2026-01-07 21:33:46 UTC

[pkg-pr-new]

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commit: 006a60c