Use parseInt when reading PC definitions

[Trantion897]

Pull Request Description

Avoids failures caused by the user defining frontmatter as a string instead of a number, such as trying to concatenate numbers as strings instead of adding

Changes Proposed

• NewPlayerModal calls parseInt() on all player values except name

Related Issues

Fixes #291

Checklist

• I have read the contribution guidelines and code of conduct.
• I have tested the changes locally and they are working as expected.
• I have added appropriate comments and documentation for the code changes.
• My code follows the coding style and standards of this project.
• I have rebased my branch on the latest main (or master) branch.
• All tests (if applicable) have passed successfully.
• I have run linters and fixed any issues.
• I have checked for any potential security issues or vulnerabilities.

Screenshots (if applicable)

Additional Notes