- Hide exchange dropdown for paper trades (uses single synthetic market)
- Add _updateExchangeRowVisibility() to toggle exchange row visibility
- Call visibility update on target change and form open
- Remove stale 'binance' fallback in Trade constructor call
(Trade.__init__ now handles exchange normalization for paper trades)
Addresses codex feedback:
- Medium: UX mismatch where exchange choice appeared relevant for paper
- Low: Dead code passing 'binance' for paper trades
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
rob
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