Add test_hybrid_continuous_thrust for finite-duration burn handling
- Tests continuous low-thrust burns (ion engines)
- Tests multi-burn sequences with separate burn phases
- Tests mode transitions between analytical propagation and Cartesian burns
- Tests energy conservation during finite-duration burns
- Tests accuracy of continuous vs. impulsive burn approaches
- Tests propagation during continuous burn phases
- Tests numerical stability during many burn/conversion cycles
- Validates hybrid approach for continuous thrust scenarios
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