New /trades page for viewing user's Bitcoin trades:
- Upcoming trades with cancel functionality
- Trade history (completed, cancelled, no-show)
- Direction badges (BUY/SELL with colors)
- EUR ↔ BTC amounts in readable format
- Rate and premium display
Update Header navigation:
- Exchange replaces Book for regular users
- My Trades replaces Appointments
Update profile page test for new nav items.
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