fix: navbar active links, openapi error handling, memory leaks, and t…

[AliceTenni]

…esting guide

Fixes #205, #201, #207, and #198

Changes:

• Add navbar active link highlighting with CSS styling (Fix Navbar Links Not Highlighting Active Page #205)

  • Active links now display with green color, font-weight 600, and bottom border
  • Docusaurus automatically applies navbar__link--active class

• Handle missing openapi.yaml gracefully (Fix OpenAPI Spec Loading Errors When File is Missing #201)

  • Check for spec file existence before rendering
  • Show helpful error message with setup instructions instead of crashing
  • Prevents portal crash when spec is missing

• Fix memory leaks in API testing widget (Fix Memory Leaks in API Testing Widget #207)

  • Add AbortController to cancel fetch requests on unmount
  • Implement DOM cleanup to remove Redoc event listeners
  • Add container ref for proper lifecycle management
  • Reduce memory overhead with optimized Redoc config options

• Create comprehensive integration testing guide (Create Integration Testing Setup Guide #198)

  • Setup instructions with Jest configuration
  • Example test patterns: validation, errors, rate limiting, transactions
  • Best practices: test isolation, fixtures, helper functions, naming
  • Environment configuration and CI/CD examples
  • Troubleshooting section

Closes #205
Closes #198
Closes #207
Closes #201

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