- Add 'content' type to StreamDisplayEvent for tracking text chunks
- Track content events in streamEvents array for chronological display
- Update render to use Switch/Match for cleaner conditional rendering
- Interleave thinking, tool calls, and content as they stream in
- Add fallback for old messages without streamEvents for backwards compat
Previously, tool/command outputs stayed at top while AI text responses
accumulated at the bottom. Now all events appear in order like a
normal chatbot.