Use ClaudeBinaryResolver instead of null binary path in extension services
(McpHealthDiagnosticsService, PluginInstallService, McpInstallService).
Packaged Electron on macOS has minimal PATH — bare `claude` lookup fails
with ENOENT. Now all CLI calls resolve the binary via ClaudeBinaryResolver
which checks PATH, NVM, standard install dirs and login shell env.
- Add buildEnrichedEnv() helper for child process env (PATH, HOME, USERPROFILE)
- Add stale cache re-verification with 30s TTL in ClaudeBinaryResolver
- Guard execCli() against null binaryPath with explicit error
- Replace projectPath.startsWith('/') with path.isAbsolute() for Windows
- Extract CLI_NOT_FOUND_MARKER/MESSAGE constants for consistent error detection
- Show amber info banner instead of red error when CLI not installed
- Introduced ApiKeyService for managing API keys, including listing, saving, deleting, and looking up values.
- Added IPC channels for API key operations and integrated them into the Electron API.
- Implemented GitHub stars fetching for MCP servers, enhancing visibility of repository popularity.
- Updated UI components to display GitHub stars and API key management features, including a dedicated API Keys tab.
- Enhanced McpInstallService to support custom MCP server installations with improved validation and error handling.
- Refactored various components to accommodate new features and improve user experience.
