fix all problem and test the windows version

[m7medVision]

…e gh auth login error

[gemini-code-assist]

Summary of Changes

Hello @m7medVision, 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 introduces significant improvements to the application's authentication flow, particularly for the Copilot provider, by integrating with the GitHub CLI for token management. It also enhances cross-platform compatibility, specifically for Windows environments, by refining configuration path resolution. These changes aim to resolve authentication errors and provide a more robust and user-friendly experience.

Highlights

• GitHub CLI Integration for Authentication: The application now leverages the GitHub CLI (gh auth token) to retrieve authentication tokens for the Copilot provider, enhancing security and simplifying the setup process by removing reliance on environment variables.
• Improved Windows Compatibility: Configuration directory detection on Windows has been refined to use os.UserHomeDir(), addressing previous issues and improving reliability for Windows users.
• Simplified Copilot Token Handling: The internal token exchange mechanism for Copilot has been streamlined by removing the exchangeGitHubToken function, directly using the GitHub token obtained from the CLI as the bearer token.
• Model Naming Standardization: Default model names for both OpenAI and Copilot providers have been updated to openai/gpt-5-mini for consistency across the application.

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[gemini-code-assist]

Code Review

This pull request introduces several fixes, primarily focused on GitHub authentication and improving Windows compatibility. Key changes include integrating with the gh CLI to fetch authentication tokens, removing the now-obsolete Copilot token exchange mechanism, and correcting the configuration directory path logic for Windows. My review identifies a critical issue where the application would exit if the user's home directory couldn't be found on Windows. I've also pointed out a medium-severity regression where support for configuring API keys via environment variables was removed, and I've provided suggestions to address both points.

[gemini-code-assist]

Calling os.Exit(1) within a library function like getConfigDir is a critical issue, as it will terminate the entire application if it fails to determine the user's home directory. This makes the package non-reusable and difficult to test. The function should handle this error gracefully instead of exiting. For instance, it could log the error to stderr and fall back to a sensible default, such as the current directory.

		if err != nil {
			fmt.Fprintf(os.Stderr, "Warning: could not determine user home directory: %v. Using current directory for config.\n", err)
			return "."
		}

[gemini-code-assist]

This change removes the logic for loading the GitHub token from GITHUB_TOKEN or GITHUB_MODELS_TOKEN environment variables. This is a regression in functionality, as users who previously relied on these environment variables will find that they no longer work. It's a common and good practice to check for environment variables before falling back to other methods like executing an external command, as it's faster and provides a conventional configuration method.

    if token := os.Getenv("GITHUB_TOKEN"); token != "" {
		return token, nil
	}
	if token := os.Getenv("GITHUB_MODELS_TOKEN"); token != "" {
		return token, nil
	}
	tok, err := tryGetTokenFromGHCLI()
	if err == nil && tok != "" {
		return tok, nil
	}