feat: add compact styled output for TODO tools
TODO tools (todo_read, todo_write) now display with a cleaner, more
compact format:
- Styled header: " ● todo_read" or " ● todo_write"
- Tree-style prefixes for content lines (│ and └)
- Checkbox conversion: "- [ ]" → □, "- [x]" → ■
- Dimmed content for visual distinction
- No timing footer (cleaner output)
Changes:
- Add print_todo_compact() method to UiWriter trait
- Implement print_todo_compact() in ConsoleUiWriter
- Update todo.rs to call print_todo_compact() instead of line-by-line output
- Skip tool header, output header, and timing for TODO tools in agent streaming
8dcb7a3dba