[test-viewer] Bump iTwinUI

[saskliutas]

Bumped iTwinUI to the latest version and updated e2e test screenshots.

[Copilot]

Pull request overview

This PR updates the test-viewer app’s dependency set, primarily bumping @itwin/itwinui-react and re-resolving the workspace dependency graph (lockfile + workspace override configuration) to reflect the new versions.

Changes:

• Bumped @itwin/itwinui-react ^3 override from 3.20.1 → 3.21.2 (workspace override).
• Updated apps/test-viewer dependencies to newer @itwin/* versions and regenerated apps/test-viewer/pnpm-lock.yaml.
• Removed the app-local pnpm.overrides block in apps/test-viewer/package.json in favor of workspace-level overrides.

Reviewed changes

Copilot reviewed 2 out of 38 changed files in this pull request and generated 2 comments.

File	Description
pnpm-workspace.yaml	Updates workspace-level override for @itwin/itwinui-react@^3 to 3.21.2.
apps/test-viewer/package.json	Bumps many @itwin/* dependencies (including iTwinUI) and removes app-local pnpm overrides.
apps/test-viewer/pnpm-lock.yaml	Regenerated lockfile reflecting the new dependency/override resolutions.

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[github-actions]

Tree-Widget benchmark

Benchmark suite	Current: 1965595	Previous: b3aed6f	Deviation	Status
models tree creates initial filtered view for 50k target items	831 ms	1149 ms	-27.68%	✅
models tree creates initial filtered view for 50k target items (P95 of main thread blocks)	101 ms	145 ms	-30.34%	〰️
models tree validates categories visibility for imodel with 50k categories	9059 ms	11595 ms	-21.87%	✅
models tree validates categories visibility for imodel with 50k categories (P95 of main thread blocks)	68 ms	86 ms	-20.93%	〰️
models tree changing model visibility changes visibility for 50k elements	2662 ms	3551 ms	-25.04%	✅
models tree changing model visibility changes visibility for 50k elements (P95 of main thread blocks)	98 ms	135 ms	-27.41%	〰️
models tree changing category visibility changes visibility for 50k elements	2107 ms	2910 ms	-27.59%	✅
models tree changing category visibility changes visibility for 50k elements (P95 of main thread blocks)	0 ms	0 ms	0%	🟰
models tree changing per-model-category override changes visibility for 50k elements	2198 ms	3276 ms	-32.91%	✅
models tree changing per-model-category override changes visibility for 50k elements (P95 of main thread blocks)	0 ms	0 ms	0%	🟰
models tree changing element visibility changes only parent nodes visibility with 50k elements	3376 ms	4933 ms	-31.56%	✅
models tree changing element visibility changes only parent nodes visibility with 50k elements (P95 of main thread blocks)	68 ms	100 ms	-32%	〰️
categories tree creates initial filtered view for 50k items	1261 ms	1892 ms	-33.35%	✅
categories tree creates initial filtered view for 50k items (P95 of main thread blocks)	335 ms	345 ms	-2.90%	〰️
categories tree changing definition container visibility changes visibility for 50k subCategories	2280 ms	3834 ms	-40.53%	✅
categories tree changing definition container visibility changes visibility for 50k subCategories (P95 of main thread blocks)	36 ms	55 ms	-34.55%	〰️
categories tree changing definition container visibility changes visibility for 50k categories	4644 ms	8997 ms	-48.38%	✅
categories tree changing definition container visibility changes visibility for 50k categories (P95 of main thread blocks)	89 ms	186 ms	-52.15%	✅

This comment was automatically generated by workflow using github-action-benchmark.