test(lib): add coverage for secondary market, portfolio, batch transa…

[AbdulSnk]

📌 Description

This PR addresses critical missing unit test coverage across key utilities and service modules in src/lib/. It pins down core business logic, data mapping, transaction encoding, and security mechanisms ahead of pending mock migrations and refactors.

🚀 Changes Included

1. secondaryMarketService Tests (#931)

• Added unit test suite for src/lib/secondaryMarketService.ts.
• Tested listing filtering logic against target attributes to ensure filtering behaviors remain intact when replacing mock data (MOCK_LISTINGS).

2. portfolioService Tests (#930)

• Added unit test suite for src/lib/portfolioService.ts.
• Verified contract shape and output schemas for token holdings (MOCK_TOKEN_HOLDINGS) and gas-balance mappings (MOCK_GAS_BALANCES) consumed by the portfolio store and dashboard.

3. batchTransaction Tests (#932)

• Added unit test suite for src/lib/batchTransaction.ts.
• Verified multi-call batch encoding structures.
• Validated revert-error decoding logic, including edge cases and the specific revert-data constant ("Insufficient balance for transfer").

4. csrf Security Utility Tests (#933)

• Added unit test suite for src/lib/csrf.ts.
• Covered getCsrfSessionId, getAuthStatePart, and generateTokenForSession.
• Tested token-to-session and auth-state binding guarantees used by GET /api/security/csrf to prevent security regressions.

Closes: #930
Closes: #931
Closes: #932
Closes: #933

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