Add depth limiting for nested parentheses in math parser to prevent stack overflow

[coderabbitai]

Context

The math parser in src/lib/litegraph/src/utils/mathParser.ts uses recursive descent parsing which can cause stack overflow with deeply nested parentheses (verified to crash around depth ~3000).

Requested Enhancement

Add a depth counter to prevent stack overflow from pathological input:

• Increment counter on each ( encountered
• Bail out if depth exceeds a reasonable limit (e.g., ~200)
• Return undefined for expressions that exceed the limit

Background

While unlikely in typical widget input scenarios, adding this safeguard would harden the parser against edge-case inputs.

References

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

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