Fix ComplexTerm symbolic_type to return ScalarSymbolic #1685
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ComplexTerm was incorrectly classified as NotSymbolic(), causing code
that checks symbolic_type (like ModelingToolkit's namespace_expr) to
skip processing its .re and .im fields.
This led to namespace bugs where variables inside complex expressions
lost their namespace prefixes during system composition.
Co-authored-by: Claude (Anthropic AI Assistant) [email protected]