Add Support for 8-Hour Candles

It would be great to have 8-hour candles added as a supported timeframe. Currently, common intervals like 1hr, 4hr, and 1D are available, but the 8hr candle fills an important gap — especially for traders who want a middle ground between the 4hr and daily charts.

An 8hr candle aligns well with major trading sessions (Asian, European, and US markets), making it a natural fit for multi-session analysis. Many traders on other platforms rely on this timeframe for identifying key support/resistance levels and trend direction.

Adding 8hr candle support would significantly improve the charting flexibility and appeal to a wider range of trading strategies.