test(wallet): add comprehensive tests for default auth

Add E2E tests for default auth functionality in wallet package.

Tests cover:
- Auth instance creation with auto-configuration
- ClientId auto-detection (sandbox vs production)
- PassportDomain derivation from chain config
- Popup callback handling for OAuth flow
- Query string management during auth callback
- Provider creation without external getUser
- Error handling for auth failures

This validates the default auth implementation added by Shine Li
in PR #2768 (feat(passport): nextjs packages).

All 28 tests passing:
- 7 tests for Auth instance creation
- 6 tests for clientId auto-detection
- 4 tests for popup callback handling
- 4 tests for provider creation
- 2 tests for error handling
- 5 tests for existing functionality

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: rodrigo-fournier-immutable