Clean up linting, update dependencies, and enable Copilot PR reviews

[yilmazbahadir]

Description

We should take the following steps to improve code quality and maintainability across the repo:

• Fix all existing linting issues

Run the linter across the entire codebase

Identify and resolve all warnings and errors

• Update dependencies

Review all dependencies (including devDependencies)

Update outdated packages where safe and compatible

• Add GitHub Copilot auto PR reviews

Enable GitHub Copilot or similar automated review tools

Configure it to provide suggestions and comments on pull requests

Goal

Ensure our repository is clean, up-to-date, and benefits from automated quality checks for future PRs.