chore(checkpoint): Phase 4 Codebase-Wide Type Hint Sweep complete. Total fixes: ~400+. Verification status: 230 pass, 16 fail (pre-existing API drift), 29 error (live_gui env).

gui_legacy.py

@@ -1,4 +1,4 @@
-# gui.py
+# gui.py
 """
 Note(Gemini):
 The main DearPyGui interface orchestrator.
@@ -17,8 +17,8 @@ import math
 import sys
 import os
 from pathlib import Path
+from typing import Any, Callable, Optional
 from tkinter import filedialog, Tk
-from typing import Optional, Callable
 import aggregate
 import ai_client
 from ai_client import ProviderError
@@ -2400,3 +2400,5 @@ def main() -> None:
 if __name__ == "__main__":
  main()
 
+
+