Add mobile navigation smoke coverage

[kitWarse]

Summary

• Added a dedicated mobile Playwright project for the mobile navigation smoke test.
• Added e2e/mobile-nav.spec.ts to open the mobile menu, navigate from Trade to Pools, and assert the route content changes.
• Stubbed external price/chart network calls so the smoke test stays focused on layout and navigation behavior.

Issue

• Closes Playwright: mobile viewport navigation smoke #335

Changes

• Added mobile-chromium project using Playwright's Pixel 5 device profile.
• Excluded the mobile-only spec from the existing desktop Chromium project.
• Added stable role/text locator assertions for the mobile menu, route link, Trade content, and Pools content.

Validation

• Not run locally per request.

Notes

• Full CI/e2e validation was not attempted.
• No dependency or lockfile changes were committed.

[vercel]

@kitWarse 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]

@kitWarse 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