feat: add GitHub authentication and dotfiles sync functionality

[bniladridas]

GitHub OAuth Authentication with Dotfiles Sync

Added GitHub OAuth authentication system with dotfiles sync functionality across machines.

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Changes

• Authentication System: Added GitHub OAuth login with token validation and secure storage
• Sync Features: Backup/restore dotfiles to private GitHub repositories with push/pull commands
• Installation Methods: Added Homebrew, UV, and direct bash installation options for user flexibility
• Bug Fix: Fixed .zshrc overwrite issue to prevent duplicate entries on multiple runs
• GitHub Actions: Added pull-requests: read permission to CodeQL workflow
• Automation: Added automated tracking workflow to update issue 📋 Master Tracking Issue: All PRs and Issues Context #52 on PR/issue events
• Dependencies: Added jq dependency check to prevent authentication failures
• Code Quality: Fixed actionlint issues in workflow configuration

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All tests pass locally and the authentication system is fully functional with secure token storage. Users can now sync dotfiles across multiple machines seamlessly. The repository now has automated tracking for all PRs and issues.

[gemini-code-assist]

Summary of Changes

Hello @bniladridas, 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 significantly enhances the dotfiles management system by integrating GitHub OAuth for user authentication and introducing a robust synchronization mechanism. Users can now securely log in and effortlessly backup or restore their dotfiles to a private GitHub repository, ensuring consistency across their development environments. Additionally, the PR streamlines the installation process with new methods and resolves a critical bug related to .zshrc configuration, improving overall reliability and user experience.

Highlights

• User Authentication: Implemented a GitHub OAuth authentication system, allowing users to log in, log out, and check their login status using a personal access token. This system securely stores credentials.
• Dotfiles Synchronization: Introduced functionality to backup (push) and restore (pull) dotfiles to/from a private GitHub repository. This enables seamless synchronization of configuration across multiple machines.
• Installation Flexibility: Expanded installation options to include direct Bash, Homebrew, and UV (Python Package Manager), alongside the existing manual clone method, improving user convenience.
• Zshrc Overwrite Fix: Addressed a bug in setup-mac.sh that prevented duplicate PS1 entries from being added to .zshrc on multiple runs, ensuring configuration integrity.
• Code Quality Improvements: Enhanced error handling, user experience, and removed unused variables across the codebase, as noted in the PR description.

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[gemini-code-assist]

Code Review

This pull request introduces a robust user authentication system using GitHub OAuth and a comprehensive dotfiles synchronization feature. The changes also include multiple installation methods and a crucial bug fix for the .zshrc overwrite issue. The new features significantly enhance the usability and management of dotfiles across different machines. Overall, the implementation is well-structured and addresses key functionalities. However, I've identified a few areas for improvement regarding security, robustness of token handling, and clarity in feature descriptions.