fix: show error stack trace for debugging

[chenjiahan]

Improving the error handling output by including the stack trace in the error string when available and standardizing string quotes.

[gemini-code-assist]

Summary of Changes

Hello @chenjiahan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on refining the error handling output for the html-rspack-plugin by incorporating stack traces into error messages, which will greatly assist in diagnosing issues. Concurrently, it addresses code style by enforcing the use of single quotes for string literals, contributing to a more uniform codebase.

Highlights

• Enhanced Error Reporting: The error handling mechanism has been improved to include the full stack trace in error messages, providing more detailed debugging information.
• Code Style Standardization: String literals within the lib/errors.js file have been standardized to use single quotes for consistency.

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[gemini-code-assist]

Code Review

This pull request improves error reporting by including the stack trace in the output, which is very helpful for debugging. It also standardizes the use of single quotes for strings. I've suggested a small improvement to the error handling logic to make it more robust for cases where an error-like object might not have all the properties of a standard Error object.

[Copilot]

Pull request overview

This PR improves error handling output by adding stack traces to error messages and standardizes quote usage from double to single quotes throughout the errors module.

Changes:

• Added stack trace support to error output (with fallback to formatted error name and message)
• Standardized string quotes from double to single quotes
• Added trailing comma for consistency

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