fix(tui): enable GitHub Copilot Enterprise authentication in /connect…

[Raviguntakala]

Problem

GitHub Copilot Enterprise authentication is missing in TUI /connect command. The CLI (auth login) supports enterprise login with deployment type selection and conditional prompts, but TUI /connect has no option for enterprise authentication at all.

Solution

Added enterprise authentication support to TUI /connect by implementing the same prompt collection logic as CLI:

• Added prompt collection loop to gather user inputs (deployment type, enterprise URL, etc.)
• Implemented conditional prompt logic for enterprise-specific fields
• OAuth callback now returns actual provider ID (github-copilot-enterprise vs github-copilot)

Changes

• dialog-provider.tsx - Added prompt collection before authorization
• auth.ts, server.ts - Return actual provider ID from OAuth callback
• dialog-model.tsx - Filter by provider.id instead of model.providerID
• provider.ts - Check both regular and enterprise auth for github-copilot plugin

Testing

• ✅ /connect with GitHub Copilot (public)
• ✅ /connect with GitHub Copilot Enterprise
• ✅ Enterprise models display correctly

---

Note: If these changes are approved, I will raise a separate PR for Desktop app support.

Before :

Screen.Recording.2026-01-05.at.11.12.39.PM.mov

After :

Screen.Recording.2026-01-05.at.11.19.25.PM.mov

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Duplicate PR Search Results

No duplicate PRs found. The searches returned the PR itself (#6974) and one tangentially related PR about IDE integration, but no other active PRs addressing the same GitHub Copilot Enterprise authentication feature in the TUI /connect command.

Summary:

• PR fix(tui): enable GitHub Copilot Enterprise authentication in /connect… #6974 - The current PR being checked (this is the only one matching your specific changes)
• PR feat(ide): IDE integration with Cursor/VSCode and improved UX #5873 - IDE integration with Cursor/VSCode (not a duplicate - different scope)

This appears to be a new, unique feature addition for TUI support of GitHub Copilot Enterprise authentication. You're good to proceed.

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.