chore: add test infrastructure and initial test suite

[dtoxvanilla1991]

Ports the test additions from community PR #57 (by @p-stam001) onto current main, adapted for the current stack.

What's added

• vitest.config.ts - explicit vitest configuration with node environment, v8 coverage (text/json/html reporters), include/exclude patterns scoped to lib/, and @ alias pointing to /lib
• lib/constants.test.ts - 3 tests for DEFAULT_TOKEN_SCOPES
• lib/types.test.ts - 15 tests covering all exported types: LoginSuccessResponse, LoginFailureResponse, LoginResponse, LogoutRequest, LogoutResult, PermissionAccess, Permissions, and UserProfile (including a test for the optional-fields case)

What was changed vs. PR #57

• No new dependencies - vitest and @vitest/coverage-v8 are already on main at ^4.0.0
• Dropped jsdom devDep - the environment is node, so jsdom is not needed
• Removed globals: true - test files use explicit import { describe, it, expect } from 'vitest' imports, consistent with the existing codebase style
• Removed @vitejs/plugin-react from vitest config - not needed for node-env tests (it's already in vite.config.ts for the build)
• Added a second UserProfile test asserting that only id is required (exercising the optional fields added in chore: upgrade TypeScript to v6 with migration fixes #90)

Test results

 ✓ lib/types.test.ts (12 tests)
 ✓ lib/constants.test.ts (3 tests)

 Test Files  2 passed (2)
      Tests  15 passed (15)
   Duration  129ms

Closes #57

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📥 Commits

Reviewing files that changed from the base of the PR and between d24fdf8 and 5840e44.

📒 Files selected for processing (3)

• lib/constants.test.ts
• lib/types.test.ts
• vitest.config.ts

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[Koosha-Owji]

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approved by mistake

[dtoxvanilla1991]

@Koosha-Owji please re-review. Thanks