Add coerceStatus test coverage to close remaining issues

[brightpixel-dev]

Closes #279
Closes #280
Closes #281

What changed

• Added coerceStatus tests to utils.test.ts: covers all 8 valid BountyStatus values, unrecognized strings, null, undefined, and empty string

Why

• PR Add Avatar test coverage, runtime status validation, and a11y fixes #329 implemented the fixes for adaptBounty passes an unrecognized backend status straight through with no validation, silently breaking both the status badge and every action button #279, MilestoneActions' Fund/Deposit buttons have no distinguishing accessible name across multiple milestones/pools, so screen-reader users can't tell which button is which out of context #280, BountyCard's h3 title skips directly from the page's h1 with no intervening h2, breaking heading-level navigation on /issues #281 but GitHub didn't auto-close the issues
• This PR adds missing test coverage for coerceStatus (adaptBounty passes an unrecognized backend status straight through with no validation, silently breaking both the status badge and every action button #279) and references the remaining issues

How to test

• npx jest src/lib/utils.test.ts — all coerceStatus tests pass

[drips-wave]

@brightpixel-dev Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[vercel]

@brightpixel-dev is attempting to deploy a commit to the chonilius' projects Team on Vercel.

A member of the Team first needs to authorize it.