Key fixes:
- Add price validation to detect/correct doubled filled_price from broker
- Emit position_closed socket event to refresh UI after closing positions
- Fix statistics not updating when positions are closed
- Filter out zero-size positions from display
- Add USD/USDT toggle for balance display (click to switch)
Trade system improvements:
- Refactor Trade class P/L calculation with realized/unrealized tracking
- Add settle() method for proper position closing
- Improve trade_filled() to use current filled qty for averaging
- Add fallback to exchange balances when broker balance unavailable
Paper broker enhancements:
- Add exchange-qualified price storage for multi-exchange support
- Add price_source tracking for positions
- Improve state persistence
Tests:
- Add comprehensive tests for trade P/L calculations
- Add tests for paper broker price source tracking
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
rob
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