fix(desktop): component cleanup + dead code removal + DeerFlow ai-elements

- ChatArea: DeerFlow ai-elements annotations for accessibility
- Conversation: remove unused Context, simplify message rendering
- Delete dead modules: audit-logger.ts, gateway-reconnect.ts
- Replace console.log with structured logger across components
- Add idb dependency for IndexedDB persistence
- Fix kernel-skills type safety improvements

desktop/src/lib/saas-client.ts

@@ -98,6 +98,7 @@ import type {
   PromptCheckResult,
   PromptTemplateInfo,
   PromptVersionInfo,
+  PaginatedResponse,
   AgentTemplateAvailable,
   AgentTemplateFull,
 } from './saas-types';