[WIP] Fix flaky test case in CI pipeline

[Copilot]

• Analyze the flaky test issue in useIsHealthDataAvailable.test.ts
• Fix race condition in test setup by ensuring mocks are properly reset between tests
• Improve waitForNextUpdate to be more reliable
• Run tests multiple times to verify stability
• Verify with typecheck and lint

Original prompt

fix this flaky test case https://github.com/kingstinct/lifeline/actions/runs/19292861998/attempts/1

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3b77471

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR