test(trade): cover market stats header

[0takuc0mrade]

Summary

• introduces the missing MarketStatsHeader component at the issue's requested path
• formats 24-hour volume and open interest compactly through the shared USD formatter
• formats mark and index prices through the same shared formatter
• falls back to an em dash for missing, NaN, or infinite values

Why

Upstream main did not contain the component named by the issue. This adds the smallest presentational API needed to render already-normalized market data without duplicating formatter logic or leaking unavailable/raw values into the UI.

Validation

• focused Bun test: 2 passed
• focused ESLint: passed
• focused Prettier: passed
• tests cover a fixed market fixture and all four unavailable-value fallbacks

The repository-wide typecheck remains red from existing upstream errors in unrelated earn, pools, routes, wallet, and Soroban files; neither new file appears in that error output.

Closes #340

[vercel]

@0takuc0mrade is attempting to deploy a commit to the Ijai's projects Team on Vercel.

A member of the Team first needs to authorize it.

[drips-wave]

@0takuc0mrade 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