Add RecentAttestationsPanel test coverage

[Mayreck]

Summary

• Add Vitest/RTL coverage for RecentAttestationsPanel empty and populated states
• Cover severity labels/classes, timestamp text, row order, compact tx hashes, and callbacks
• Document the coverage in docs/testing/RECENT_ATTESTATIONS_TESTS.md

Validation

• npx vitest run src/components/RecentAttestationsPanel/RecentAttestationsPanel.test.tsx
• npx vitest run src/components/RecentAttestationsPanel/RecentAttestationsPanel.test.tsx src/components/tests/ErrorLayout.test.tsx
• npx eslint src/components/RecentAttestationsPanel/RecentAttestationsPanel.test.tsx

Baseline notes

• npm run lint still fails on existing unrelated repo lint/syntax issues outside this patch, including src/app/api/commitments/[id]/settle/route.ts and src/components/modals/CommitmentDetailsModal.tsx
• npx tsc --noEmit is blocked by the same pre-existing syntax errors

Closes #643.

[vercel]

@Mayreck is attempting to deploy a commit to the 1nonly's projects Team on Vercel.

A member of the Team first needs to authorize it.

[GBOYEE]

I'd like to work on this.

Approach:

• I'll write the test cases and ensure they pass with full coverage
• Verify with existing tests + add new ones if needed

Estimated effort: ~1-2 hours. PR incoming shortly.

[GBOYEE]

I'd like to work on this.

Approach:

• I'll write the test cases and ensure they pass with full coverage
• Verify with existing tests + add new ones if needed

Estimated effort: ~1-2 hours. PR incoming shortly.