Add explicit test cases for unary operators after binary operators in mathParser

[coderabbitai]

Description

Add explicit parameterized test cases for unary operators appearing after binary operators in src/lib/litegraph/src/utils/mathParser.test.ts.

This pattern (2*-3, 1+-2, 2--3, -2*-3) is the #1 source of bugs in hand-rolled math parsers and is most likely to regress. While the current parser implementation handles these correctly, only 2*-3 is covered implicitly in the complex expression block.

Test Cases to Add

['1+-2', -1],
['2--3', 5],
['-2*-3', 6],
['-(2+3)*-(4+5)', 45],

References

• PR: [fix] Replace eval() with safe math expression parser #9263
• Comment: [fix] Replace eval() with safe math expression parser #9263 (comment)
• Requested by: @christian-byrne

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