Confirm correctness of minus sign handling logic in expression parser

[Copilot]

Review comment questioned whether the condition for adding + operator before -1 multiplication was incorrect. After analysis, confirmed the current implementation is correct.

The condition correctly adds + when:

• List is not empty AND
• Last item is NOT an open bracket or function

// Correctly handles: "5-2" → "5 + -1 * 2"
// Correctly skips: "(-2" → "( -1 * 2" (no + added)
if (!(list.length == 0 || 
      list.length > 0 && 
      (list[list.length - 1].type == "open bracket" || 
       list[list.length - 1].type == "function")))
{
    list.push({ content: "+", type: "operator", ... });
}

No code changes required.

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