Use mono font for cluster health metrics

[arjunkomath]

Summary

• render cluster health metric values and status text with the project monospace font
• preserve the existing labels, sizing, weight, and tabular numeral styling

Validation

• npx biome check --write components/cluster/cluster-health-summary.tsx
• git diff --check
• Oracle review: approved with no blocking findings

[github-actions]

React Doctor found no issues. 🎉

⚠️ Warning: .github/workflows/react-doctor.yml is configured incorrectly. See below to fix.

React Doctor compares against main to report only the issues this pull request introduces. This run couldn't complete that comparison (usually a shallow CI checkout with no merge base), so it listed every issue in the changed files, including ones that already existed on main.

Add fetch-depth: 0 to the actions/checkout step in .github/workflows/react-doctor.yml so the checkout includes the history React Doctor needs:

 jobs:
   react-doctor:
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0

       - uses: millionco/react-doctor@v2

To silence this warning, set silence-missing-baseline-warning: true on the React Doctor action.

_{Reviewed by React Doctor for commit df16f16.}