Format quote result values with shared helpers

[jamilahmadzai]

Closes #141

Bounty: GrantFox OSS campaign for issue #141

Summary

• Format returned quote amounts with the shared formatStroops helper when the base-unit value can be parsed safely.
• Format numeric estimated rates with the shared formatNumber helper.
• Preserve raw backend values in title attributes and fall back to raw strings when formatting would be unsafe or invalid.
• Keep the request payload/API contract unchanged and document the base-unit display behavior.

Tests

• npm test -- src/app/quote/page.test.tsx --runInBand
• npm test -- --runInBand
• npm run lint
• npm run build
• git diff --check

Notes

The quote status region remains role="status" with aria-live="polite"; only the displayed amount/rate text and raw-value titles changed.