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Enhance performance in React Chrono (#536)

* Update dependencies and enhance performance in React Chrono

- Bumped versions of several dependencies in package.json, including @types/node, @types/react, @vitejs/plugin-react, and vitest for improved compatibility and performance.
- Introduced a new PERFORMANCE_IMPROVEMENTS.md file detailing critical performance optimizations, including memory leak fixes, improved rendering efficiency, and new performance monitoring utilities.
- Implemented virtual scrolling in the new VirtualTimeline component to enhance handling of large datasets.
- Refactored GlobalContext and various hooks to optimize performance and reduce unnecessary re-renders.
- Removed unused downloads.html file from cypress directory.

* Remove VirtualTimeline component and related utilities

- Deleted the VirtualTimeline component, which provided optimized virtual scrolling for timeline items.
- Removed associated hooks and utilities that supported the virtual scrolling functionality.
- This change simplifies the codebase by eliminating unused components and improving maintainability.

* Refactor utility functions in index.ts for improved performance and maintainability

- Replaced hexToRGBA function implementation with a more efficient version using regex for validation and bit shifting for RGB extraction.
- Introduced constants for default class names and button texts to avoid object recreation on each function call.
- Simplified getDefaultThemeOrDark and getDefaultClassNames functions to return pre-defined constants.
- Enhanced getUniqueID function to utilize a more efficient ID generation method.
- Cleaned up code for better readability and performance.

* Update semver dependency version in pnpm-lock.yaml from 7.7.2 to 7.5.4 to ensure compatibility and stability.

* Refactor PerformanceMonitor class to improve code clarity and reliability

- Changed renderTimes property to be readonly, ensuring it cannot be modified after initialization.... (continued)

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