test(MWPW-160872): Adding 100% test coverage

[sanrai]

Description

This PR significantly increases the unit test coverage across multiple components and utilities by adding comprehensive test suites. The changes include:

Link to Jira Ticket: https://jira.corp.adobe.com/browse/MWPW-160872

Testing Improvements

• Added new test files for previously untested components and utilities
• Extended existing test suites with additional test cases
• Added coverage for edge cases and error scenarios
• Implemented tests for async operations and hooks
• Added tests for UI interactions and event handling

Key Changes

• Added Istanbul configuration to .babelrc for accurate coverage reporting
• Added coverage path ignore patterns in jest.config.js
• Added tests for:
  • App initialization and configuration
  • Card filtering and sorting
  • Event timing and transitions
  • Error handling in Lana logging
  • React hooks and contexts
  • DOM utilities and interactions
  • URL state management
  • Scroll behavior

Bug Fixes

• Fixed edge cases in event sorting logic
• Improved error handling in Lana logger
• Added null checks and default values for component props
• Fixed URL parameter handling

Configuration Changes

• Updated Jest configuration for coverage reporting
• Added Istanbul babel plugin for coverage instrumentation
• Updated package.json with new testing dependencies

All changes are focused on improving test coverage while maintaining existing functionality.

Testing Notes

• All new tests pass successfully
• Coverage reports show significant improvement
• No regressions in existing functionality
• Edge cases and error scenarios are now properly tested