chore(deps-dev): bump the vitest group with 4 updates

[Copilot]

Bumps the vitest group with 4 packages: @vitest/browser, @vitest/browser-playwright, @vitest/eslint-plugin, and vitest (4.0.15 → 4.0.16).

CI Failure Analysis

The vitest 4.0.16 update exposed a pre-existing hang in src/TreeView/TreeView.test.tsx. The root cause was twofold:

• vitest 4.0.16 restores the browser mode testTimeout to 15 seconds (PR #9167), after it was accidentally changed in a prior release.
• perf(TreeView): defer scrollIntoView (perf(TreeView): defer scrollIntoView to coalesce reflows during rapid navigation #7545) introduced a requestAnimationFrame in the TreeView item focus handler. vi.useFakeTimers() was faking rAF, causing act() + userEvent interactions that focus a tree item to wait for a fake rAF that never fires — hanging indefinitely and timing out after 15 seconds. The remaining 39 failures cascaded from that first timeout.

Fix: Changed both vi.useFakeTimers() calls in TreeView.test.tsx to use { toFake: ['setTimeout', 'clearTimeout', 'setInterval', 'clearInterval', 'setImmediate', 'clearImmediate'] }, explicitly excluding requestAnimationFrame from faking. All existing vi.runAllTimers() calls for setTimeout-based behavior continue to work correctly. All 51 TreeView tests now pass in browser mode.

Changelog

New

Changed

• src/TreeView/TreeView.test.tsx: Updated vi.useFakeTimers() calls to not fake requestAnimationFrame, fixing test hangs in vitest browser mode (Chromium)

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; dev-dependency bump + test fix only

Testing & Reviewing

All 51 TreeView browser-mode tests now pass. The fix is scoped entirely to the test file — no production code was changed.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

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Latest commit: 511bab0

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[francinelucca]

To unblock this PR, the TreeView browser-mode tests need to handle pending rAF callbacks (e.g., vi.useFakeTimers() + vi.runAllTimers() to flush rAF, or wrapping assertions in waitFor).

@copilot implement this

[Copilot]

To unblock this PR, the TreeView browser-mode tests need to handle pending rAF callbacks (e.g., vi.useFakeTimers() + vi.runAllTimers() to flush rAF, or wrapping assertions in waitFor).

@copilot

Implemented in commit 511bab0.

The fix changes both vi.useFakeTimers() calls in the TreeView test file to use { toFake: [...] } with an explicit list that excludes requestAnimationFrame and cancelAnimationFrame. This leaves rAF as the real browser API while keeping setTimeout/setInterval/etc. fake (so existing vi.runAllTimers() calls still work).

Root cause: vi.useFakeTimers() was faking all timers including rAF. The perf(TreeView): defer scrollIntoView change (#7545) introduced a rAF in the onFocus handler. In vitest 4.0.16 browser mode (Chromium), when userEvent focuses a tree item, act() waits for the pending fake rAF — which never fires — causing the test to hang indefinitely and time out after 15 seconds.

All 51 TreeView tests now pass in browser mode.

[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.