Fix OpenCode GitHub Copilot authentication detection

[mcbodge]

Problem

When users authenticate with OpenCode using GitHub Copilot (opencode auth login → GitHub Copilot), the app fails to detect the authentication during the setup wizard. The UI shows "Not Logged In" even though the user has successfully authenticated.

Root Cause

Two issues in libs/platform/src/system-paths.ts:

1. Missing provider in detection list: The OPENCODE_PROVIDERS array didn't include github-copilot or copilot, so the auth detection completely ignored GitHub Copilot credentials in the auth file.

2. Only checking access tokens: The hasProviderOAuth() function only checked for non-empty access tokens. However, GitHub Copilot uses OAuth refresh tokens - the auth file stores a refresh token while the access field remains empty until the token is used:

   {
     "github-copilot": {
       "type": "oauth",
       "refresh": "ghu_xxxxx",
       "access": "",
       "expires": 0
     }
   }

Solution

1. Added github-copilot and copilot to the OPENCODE_PROVIDERS list
2. Updated hasProviderOAuth() to check for either access OR refresh tokens when type is oauth

Testing

• Verified auth file is read correctly from ~/.local/share/opencode/auth.json on Windows
• After fix, the setup wizard correctly detects GitHub Copilot authentication and shows "Ready" status

Affected Components

• libs/platform/src/system-paths.ts - Auth detection logic

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[gemini-code-assist]

Summary of Changes

Hello @mcbodge, 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 resolves an issue where OpenCode failed to detect successful GitHub Copilot authentication, leading to a 'Not Logged In' status in the setup wizard. The changes ensure that GitHub Copilot is properly recognized as an authentication provider and that its OAuth refresh tokens are correctly identified, allowing users to proceed with the application setup seamlessly.

Highlights

• Provider Recognition: Added 'github-copilot' and 'copilot' to the OPENCODE_PROVIDERS list, allowing the system to recognize these as valid authentication providers.
• OAuth Detection Logic: Updated the hasProviderOAuth() function to check for the presence of either access or refresh tokens for OAuth type credentials, specifically addressing how GitHub Copilot uses refresh tokens.

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[gemini-code-assist]

Code Review

This pull request correctly addresses the GitHub Copilot authentication detection issue by adding the necessary providers and updating the token validation logic to include refresh tokens. The changes are clear and effectively solve the problem. I've included one suggestion to refactor the token checking logic for better conciseness and maintainability by reusing an existing helper function.

[gemini-code-assist]

This logic is correct, but it can be made more concise and less repetitive by using the existing hasNonEmptyStringField helper function, which is defined earlier in this file. This will improve readability and maintainability by reducing duplicated code.

      if (auth.type === 'oauth' && hasNonEmptyStringField(auth, ['access', 'refresh'])) {
        return true;
      }
      // Also check for access_token/refresh_token fields directly
      if (hasNonEmptyStringField(auth, ['access_token', 'refresh_token'])) {
        return true;
      }