feat(agents): Add GitHub agent import feature

- Implemented GitHub agent browser in CCAgents component
- Created GitHubAgentBrowser component for browsing and importing agents
- Added Rust commands for fetching and importing agents from GitHub
- Updated API layer with GitHub agent import methods
- Updated Cargo.toml with new dependencies
- Fixed Tauri configuration and capabilities
- Added dropdown menu for import options
- Implemented search and preview functionality for GitHub agents

package.json

@@ -12,6 +12,7 @@
   "dependencies": {
     "@hookform/resolvers": "^3.9.1",
     "@radix-ui/react-dialog": "^1.1.4",
+    "@radix-ui/react-dropdown-menu": "^2.1.15",
     "@radix-ui/react-label": "^2.1.1",
     "@radix-ui/react-popover": "^1.1.4",
     "@radix-ui/react-select": "^2.1.3",