feat(rag): final refinements for Phase 4 support and UI visualization

src/events.py

@@ -142,10 +142,20 @@ class UserRequestEvent:
   self.base_dir = base_dir
 
  def to_dict(self) -> Dict[str, Any]:
+  # Ensure all file items and base_dir are JSON serializable
+  serializable_files = []
+  for f in self.file_items:
+   if hasattr(f, 'to_dict'):
+    serializable_files.append(f.to_dict())
+   elif isinstance(f, (str, dict, list, int, float, bool, type(None))):
+    serializable_files.append(f)
+   else:
+    serializable_files.append(str(f))
+
   return {
    "prompt": self.prompt,
    "stable_md": self.stable_md,
-   "file_items": self.file_items,
+   "file_items": serializable_files,
    "disc_text": self.disc_text,
-   "base_dir": self.base_dir
+   "base_dir": str(self.base_dir)
   }