Clean up ESLint errors (frontend 77, backend 17) so CI lint gates can be enforced

[attyolu]

##closes #913

I’m preparing the exact patch state for a clean commit and then I’ll give you the PR summary text in markdown.

Ran terminal command: cd /workspaces/StellarCert && git status --short && git add . && git commit -m "fix: clear eslint debt and restore ci lint checks" && git push --set-upstream origin ESLint

✅ Changes committed and pushed

• Branch: ESLint
• Commit: d814ae7
• Push target: origin/ESLint

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PR message (Markdown)

Title

fix: clear eslint debt and restore ci lint checks

Body

Summary

This PR clears the existing ESLint debt that was blocking the CI lint gates and re-enables the lint steps for both the frontend and backend jobs.

What changed

• Removed the stale React Refresh rule definition/configuration that was causing frontend lint failures
• Fixed the actual JSX escaping issues in the frontend
• Removed stale disable comments that referenced a rule no longer present in the project config
• Fixed backend lint violations, including:
  • unnecessary async functions
  • unnecessary escape characters
  • promise misuse patterns
  • a no-op async test callback
• Re-added the lint jobs to the CI workflow for both frontend and backend

Verification

I verified the repo-level lint commands pass successfully:

• npm run lint:frontend
• npm run lint:backend

Both complete successfully with exit code 0.

Notes

This keeps the lint gate enforceable again without changing the intended runtime behavior of the app.

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[feyishola]

Reviewed against #913 and verified end-to-end: clears the lint debt (backend lint AND frontend lint now pass with --max-warnings 0), backend build + 259 tests pass, frontend build passes, and it correctly re-adds the Lint frontend/Lint backend CI gates with the right cache paths. Thanks @attyolu! 🎉