Replace eval() with math expression library (e.g., Math.js)

[coderabbitai]

Description

The current implementation of mathematical expression evaluation in number widgets uses eval() to parse and evaluate user input expressions. This should be replaced with a dedicated math expression library for better security and functionality.

Context

• Current implementation: evaluateInput() function in src/lib/litegraph/src/utils/widget.ts
• Previous testing was done with expr-eval
• Math.js is suggested as a potentially better option

Related

• PR: Implement vue math #7759
• Comment: Implement vue math #7759 (comment)
• Requested by: @DrJKL

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