Simplify agent screen layout by removing redundant status bar container and consolidating all footer controls into the input area component. Add smooth fade animations for realtime mode transitions and a floating scroll-to-bottom button for better UX.
Changes:
- Consolidate status bar and controls into AgentInputArea for cleaner layout hierarchy
- Add scroll-to-bottom button to AgentStreamView with fade animations
- Fix realtime controls stacking on non-agent screens
- Add lastActivityAt serialization to MCP server agent responses
- Remove unnecessary layout wrapper in agent screen
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Co-Authored-By: Claude <noreply@anthropic.com>
