1. Added band creation:
- Create horizontal price lines for RSI overbought/oversold bands
- Use createPriceLine() on the RSI series after it's created
- Create lines at indicator.params.overbought and indicator.params.oversold levels
- Store band references to prevent creating duplicate lines
2. Fixed line width priority:
- Changed from 'indicator.params._lineWidth || plot.width || lineWidth'
- To 'plot.width || indicator.params._lineWidth || lineWidth'
- This ensures RSI bands use fixed 1px width from plot.width metadata
- User can still adjust line width for other indicators
Result: RSI bands now visible as dashed lines at 70/30 levels
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