Fix CI: Remove unused @variables import and fix formatting in ModelingToolkitExt

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Checklist

Thank you for contributing to HarmonicBalance.jl! Please make sure you have finished the following tasks before finishing the PR.

• Appropriate tests were added and tested locally by running: make test.
• Any code changes should be julia formatted by running: make format.
• All documents (in docs/ folder) related to code changes were updated and able to build locally by running: make docs.

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Description

Fixed two CI failures in ext/ModelingToolkitExt.jl:

1. ExplicitImports Check: @variables macro was imported but never used in executable code (only appeared in documentation examples)
2. JuliaFormatter Check: Import statement formatting needed adjustment to meet style requirements

Changes:

• Removed @variables from Symbolics imports in ext/ModelingToolkitExt.jl
• Reformatted Symbolics import statement to single line as required by JuliaFormatter

All other Symbolics imports (simplify, Equation, substitute, Num, expand, unwrap, arguments, wrap) remain and are actively used.

Related issues or PRs

Fixes continuous integration test failures.

Additional context

N/A

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[oameye]

@copilot Can you fix the formatting CI failure?

[Copilot]

@copilot Can you fix the formatting CI failure?

Fixed the formatting issue by putting the Symbolics imports on a single line as required by JuliaFormatter. Commit: 3015af9

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