Implement modular chart layers and error handling for Crypto Trading Bot Dashboard
- Introduced a comprehensive chart layer system in `components/charts/layers/` to support various technical indicators and subplots.
- Added base layer components including `BaseLayer`, `CandlestickLayer`, and `VolumeLayer` for flexible chart rendering.
- Implemented overlay indicators such as `SMALayer`, `EMALayer`, and `BollingerBandsLayer` with robust error handling.
- Created subplot layers for indicators like `RSILayer` and `MACDLayer`, enhancing visualization capabilities.
- Developed a `MarketDataIntegrator` for seamless data fetching and validation, improving data quality assurance.
- Enhanced error handling utilities in `components/charts/error_handling.py` to manage insufficient data scenarios effectively.
- Updated documentation to reflect the new chart layer architecture and usage guidelines.
- Added unit tests for all chart layer components to ensure functionality and reliability.
