- enhance fractal viewer with responsive UI and modern design

- implement two-tier rendering system with web workers for smoother interaction
- add preset management and sharing functionality via URL parameters
- introduce fullscreen mode and gallery for saved fractals
- improve mobile support with touch gestures for pan and pinch-zoom
- add performance monitoring with FPS counter and render time tracking
- implement theme switching between light and dark modes
- add randomization feature for discovering interesting fractal configurations

Author: TobiasMue91