RSI Changes:
- Add overbought and oversold level inputs (default 70/30)
- Update calculate() to return overboughtBand and oversoldBand instead of hardcoded bands
- Update plots to use overboughtBand and oversoldBand with fixed style='dashed' and width=1
- This makes RSI bands adjustable while keeping line style and width fixed
Configuration Panel:
- Hide Line Type and Line Width settings for RSI (indicator.type === 'rsi')
- RSI bands always dashed at 1px width as standard
- Overbought and oversold levels now appear as configurable parameters
7539830524