type StreamChunkType = 
  | "content"
  | "tool_call"
  | "tool_result"
  | "done"
  | "error"
  | "approval-requested"
  | "tool-input-available"
  | "thinking";

type StreamChunkType = 
  | "content"
  | "tool_call"
  | "tool_result"
  | "done"
  | "error"
  | "approval-requested"
  | "tool-input-available"
  | "thinking";