```

refactor: improve agent notification types and fix activity curator

- Convert agent notifications to discriminated union (session/permission/status)
- Fix activity curator to properly handle typed session updates
- Serialize Date objects in AgentInfo for JSON compatibility
- Use activity curator for title generation context
- Reduce console.error to console.warn for non-critical WebSocket errors
- Improve spacing in agent stream views
- Delay title generation until 15+ updates available
```

packages/app/src/components/agent-stream-view.tsx

@@ -53,7 +53,7 @@ export function AgentStreamView({
       <ScrollView
         ref={scrollViewRef}
         style={stylesheet.scrollView}
-        contentContainerStyle={{ paddingTop: 16, paddingBottom: Math.max(insets.bottom, 32) }}
+        contentContainerStyle={{ paddingTop: 24, paddingBottom: Math.max(insets.bottom, 32) }}
       >
         {streamItems.length === 0 ? (
           <View style={stylesheet.emptyState}>