feat: Enhance Marketplace and Skill Management UI with improved error handling and user feedback

- Updated MarketplaceDrawer to include security notes and manual installation hints.
- Refactored SkillDetailDrawer to display default icons for skills.
- Simplified SkillListItem to use default icons for better readability.
- Integrated gateway status checks and warnings in SkillsPage for improved user awareness.
- Enhanced error handling for skill installation and fetching, providing clearer feedback to users.
- Added new translations for error messages and gateway warnings to improve localization support.

electron/api/context.ts

@@ -1,9 +1,11 @@
 import type { BrowserWindow } from 'electron';
 import type { gatewayManager } from '@electron/gateway/manager';
 import type { providerApiService } from '@electron/service/provider-api-service';
+import type { ClawHubService } from '@electron/gateway/clawhub';
 
 export interface HostApiContext {
   gatewayManager: typeof gatewayManager;
   providerApiService: typeof providerApiService;
   mainWindow: BrowserWindow | null;
+  clawHubService: ClawHubService;
 }