fix: rack groups disco dance

[astandrik]

Closes #2711

Stand

CI Results

Test Status: ⚠️ FLAKY

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
378	373	0	3	2

Test Changes Summary ⏭️2

⏭️ Skipped Tests (2)

1. Scroll to row, get shareable link, navigate to URL and verify row is scrolled into view (tenant/diagnostics/tabs/queries.test.ts)
2. Copy result button copies to clipboard (tenant/queryEditor/queryEditor.test.ts)

Bundle Size: ✅

Current: 85.39 MB | Main: 85.39 MB
Diff: +2.22 KB (0.00%)

✅ Bundle size unchanged.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
• 📊 indicates links to detailed reports.
• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.

[Copilot]

Pull Request Overview

This PR fixes a "disco dance" issue with rack groups by implementing dynamic table offset calculation in the PaginatedTable component. The fix addresses visual jumping/repositioning problems that occur when table groups expand or collapse by computing real-time DOM-based offsets instead of using static cached values.

Key changes:

• Replaced static tableOffset calculation with dynamic DOM-based offset computation
• Added offscreen detection to freeze updates for tables outside the viewport
• Improved scroll-based virtualization with better performance and stability

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/components/PaginatedTable/utils.tsx	Replaced calculateElementOffsetTop with getCurrentTableOffset and added isTableOffscreen utility for dynamic offset calculation
src/components/PaginatedTable/useScrollBasedChunks.ts	Updated hook to use dynamic offset calculation and added offscreen freeze logic with comprehensive documentation
src/components/PaginatedTable/TableChunksRenderer.tsx	Removed tableOffset prop dependency as it's now calculated dynamically
src/components/PaginatedTable/PaginatedTable.tsx	Removed static tableOffset state and related useLayoutEffect for calculating table position