chore(deps): upgrade to Vitest v5.0.0 RC2

[ghiscoding]

Summary

Upgrade the repository test tooling from Vitest v4 to Vitest 5.0.0-rc.2.

Why

Vitest 5’s JSDOM environment conflicts with jsdom-global/register, causing readonly window.document errors. The upgrade also exposed test mocks and expectations that relied on Vitest 4 behavior.

Changes

• Updated Vitest, Vitest UI, and coverage packages to v5 RC.
• Removed redundant jsdom-global/register setup.
• Restored native JSDOM getComputedStyle behavior.
• Updated navigator and clipboard mocks for Vitest 5.
• Corrected test expectations for window realms, mock call counts, row movement, and event typing.
• No production source code changes.

Validation

• pnpm test --run: 213 files, 5,965 tests passed.
• pnpm lint: passed.
• pnpm prettier:check: passed.
• git diff --check: passed.
• Builds and framework E2E tests were not run.

Comments

The changes are limited to test tooling and test files.

AI / LLM assistance

• AI / LLM assistance used: Yes
• Which tool/model: Codex, GPT-5.6 Luna
• How was it used: Diagnosed Vitest/JSDOM compatibility issues, updated test setup and expectations, and verified the complete unit-test suite.

Checklist

• The changes are limited to only one scope.
• Tests were updated where appropriate.
• Documentation was updated where appropriate. (Not needed for this test-tooling change.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (2489bbc) to head (70dfd0f).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2775   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         199      199           
  Lines       25763    25763           
  Branches     9128     9128           
=======================================
  Hits        25763    25763           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <ø> (ø)

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commit: 70dfd0f