Add edge case tests for math parser number formats

[coderabbitai]

Context

Follow-up to PR #9263 which replaced eval() with a safe math expression parser.

Requested by @christian-byrne in #9263 (comment)

Description

The math parser test suite should be extended to explicitly cover number format edge cases that are common gotchas in math parsers:

• Trailing dot: 123. (should evaluate to 123)
• Trailing dot in expression: 123.+3 (should evaluate to 126)
• Lone dot: . (should return undefined)
• Double dot: 123.. (should return undefined)

These edge cases are covered in expr-eval's test suite and would improve confidence in the parser's robustness.

Location

File: src/lib/litegraph/src/utils/mathParser.test.ts

References

• PR: [fix] Replace eval() with safe math expression parser #9263
• Comment: [fix] Replace eval() with safe math expression parser #9263 (comment)

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