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/pnpm-lock.yaml

@@ -29,6 +29,9 @@ importers:
       framer-motion:
         specifier: ^12.38.0
         version: 12.38.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      idb:
+        specifier: ^8.0.3
+        version: 8.0.3
       lucide-react:
         specifier: ^0.577.0
         version: 0.577.0(react@19.2.4)
@@ -2075,6 +2078,9 @@ packages:
     resolution: {integrity: sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==}
     engines: {node: '>=0.10.0'}
 
+  idb@8.0.3:
+    resolution: {integrity: sha512-LtwtVyVYO5BqRvcsKuB2iUMnHwPVByPCXFXOpuU96IZPPoPN6xjOGxZQ74pgSVVLQWtUOYgyeL4GE98BY5D3wg==}
+
   ignore@5.3.2:
     resolution: {integrity: sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==}
     engines: {node: '>= 4'}
@@ -5323,6 +5329,8 @@ snapshots:
     dependencies:
       safer-buffer: 2.1.2
 
+  idb@8.0.3: {}
+
   ignore@5.3.2: {}
 
   ignore@7.0.5: {}