Bu5hm4nn f9ea7f0b67 fix: address PR review issues for event comparison and backtests ...

Critical fixes:
- Add validate_and_calculate_units() helper with proper error handling
- Handle division by zero for entry_spot in refresh_preview() and render_report()
- Add server-side validation for initial_value > 0
- Add try/except for derive_entry_spot() to handle fixture source limitations

Important improvements:
- Add dynamic default dates with get_default_backtest_dates()
- Add validate_date_range_for_symbol() for symbol-specific date bounds
- Add SYMBOL_MIN_DATES validation for backtests
- Update date_range_hint based on selected symbol

Tests:
- Add test_page_validation.py with 21 tests for:
  - validate_and_calculate_units edge cases
  - validate_date_range_for_symbol bounds checking
  - get_default_backtest_dates dynamic generation
  - SYMBOL_MIN_DATES constant verification

2026-03-29 18:45:29 +02:00

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