test(env): add unit tests for loadEmailJSConfig, loadSupabaseConfig, loadAdminConfig and loadStellarConfig (closes #94)

[Ranjeet2063]

Summary of Changes

Resolves issue #94 by adding comprehensive unit tests for the environment configuration loaders in lib/env.ts (loadEmailJSConfig, loadSupabaseConfig, loadAdminConfig, and loadStellarConfig).

Key Changes

• Extended tests/lib/env.test.ts with tests verifying:
  1. loadEmailJSConfig:
     • Loads valid serviceId, templateId, publicKey, and defaultRecipientEmail.
     • Pushes descriptive validation errors when required variables are unset.
     • Treats whitespace-only values as missing and trims non-empty values.
  2. loadSupabaseConfig:
     • Loads valid url and anonKey.
     • Pushes validation errors when required variables are missing or whitespace-only.
  3. loadAdminConfig:
     • Trims and lowercases comma-separated email addresses, ignoring empty entries.
     • Returns [] for empty string, whitespace, or comma-only values.
  4. loadStellarConfig:
     • Loads network and rpcUrl defaults and requires NEXT_PUBLIC_CHECKOUT_CONTRACT_ID.
     • Validates missing or whitespace checkout contract id.

Verification (2x Verified)

• npx vitest run tests/lib/env.test.ts (21/21 tests pass)
• npm run type-check (0 errors)
• npm run lint (0 errors)
• npx prettier --check (100% formatted)

Closes #94

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