- StreamingMessageComponent was just a wrapper around AssistantMessageComponent
- AssistantMessageComponent now handles its own stats rendering
- Made AssistantMessageComponent updatable with updateContent()
- Removed duplicate stats handling code from tui-renderer
- All stats are now managed by the component itself
- Create UserMessageComponent - handles user messages with spacing
- Create AssistantMessageComponent - handles complete assistant messages
- Create ThinkingSelectorComponent - wraps selector with borders
- Add setSelectedIndex to SelectList for preselecting current level
- Simplify tui-renderer by using dedicated components
- Much cleaner architecture - each message type is now a component
