test(profile): add page.test.tsx covering loading, disconnected, and connected states (fixes #240)

[ZacLou]

Summary

Adds the missing test file for app/profile/page.tsx, matching the coverage present in sibling route directories (app/dashboard/__tests__/page.test.tsx, app/streams/__tests__/page.test.tsx).

Coverage

• loading — renders skeleton pulse while connecting is true
• disconnected — shows connect prompt and link to home
• connected — displays wallet provider, shortened public key, CopyHashButton, and quick links
• Edge cases: null publicKey despite connected=true; null walletName falls back to Unknown

Acceptance Criteria

• Test file added with coverage comparable to sibling route directories
• No behaviour change to the page component itself

[ZacLou]

Hi @Jaydbrown — this PR adds the missing profile page tests (fixes #240). All CI checks (lint, typecheck, unit tests, build) are now green. Could you take a look when you have a moment? Thanks!