Add OpenCode CLI Provider Support to ModelSelector

[mcbodge]

Summary

This PR adds support for the OpenCode CLI provider in the ModelSelector component, enabling users to access GitHub Copilot models and other providers authenticated through the OpenCode CLI.

Changes

apps/ui/src/components/views/board-view/shared/model-selector.tsx

• Added OpenCode as a fourth provider option alongside Claude, Cursor CLI, and Codex CLI
• Implemented OpenCode model fetching from the store on component mount
• Added UI for displaying OpenCode models with proper loading, error, and empty states
• Models dynamically fetched via OpenCode CLI are displayed with tier badges (Free, Balanced, Premium)
• Added provider availability check for OpenCode CLI authentication status

Features

• Provider Selection: Users can now select OpenCode CLI as their AI provider
• Dynamic Model Discovery: Models are automatically fetched from the OpenCode CLI, including GitHub Copilot models (claude-sonnet-4, gpt-5.2-codex, etc.)
• Model Tiers: Models are badged by tier (Free, Balanced, Premium) for easy identification
• Error Handling: Proper error states with retry functionality if model fetching fails
• Loading States: Shows loading spinner while models are being fetched
• Authentication Warning: Displays warning when OpenCode CLI is not installed or authenticated

Testing

1. Ensure OpenCode CLI is installed (npx opencode-ai@latest --version)
2. Authenticate with a provider (e.g., npx opencode-ai@latest auth login and select GitHub Copilot)
3. Open the model selector in the feature creation dialog
4. Verify OpenCode CLI appears as a provider option
5. Select OpenCode CLI and verify models are loaded and displayed
6. Verify models can be selected and used for feature generation

Screenshots

Checklist

• Code follows project style guidelines
• Changes are consistent with existing CLI provider implementations
• No breaking changes to existing functionality

[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 significantly expands the AI model selection capabilities within the application by integrating the OpenCode CLI as a new provider. This integration allows users to seamlessly access and utilize a broader range of AI models, including those from GitHub Copilot, directly through the ModelSelector component, enhancing flexibility and choice for AI-powered features.

Highlights

• OpenCode CLI Provider Integration: The ModelSelector component now supports OpenCode CLI as a new AI provider, allowing users to select models authenticated via OpenCode CLI, including GitHub Copilot models.
• Dynamic Model Discovery and Display: OpenCode models are dynamically fetched from the OpenCode CLI on component mount and displayed within the UI, complete with loading, error, and empty states.
• Model Tier Badging: Dynamically fetched OpenCode models are visually differentiated with 'Free', 'Balanced', and 'Premium' tier badges for easy identification.
• Provider Availability and Error Handling: The UI includes checks for OpenCode CLI installation and authentication status, displaying warnings if unavailable and providing retry functionality for model fetching errors.
• Default Model Selection: Logic has been added to automatically select a default OpenCode model when the OpenCode provider is chosen.

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[gemini-code-assist]

Code Review

This pull request successfully adds support for the OpenCode CLI provider to the ModelSelector. The implementation is consistent with existing providers. My feedback primarily focuses on opportunities to refactor duplicated code. Several sections, including model fetching logic, UI for provider buttons, and the model list display, are nearly identical to those for other providers. Extracting this repeated logic into reusable hooks and components would significantly improve the maintainability and scalability of the ModelSelector component. I've also pointed out the use of a hardcoded string that should be replaced with a shared constant.