fix: Disable streaming if main model does not support it

aider/main.py

@@ -577,6 +577,11 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
         args.map_refresh = "files"
 
     try:
+        if not main_model.streaming:
+            if args.stream:
+                io.tool_warning("Warning: Streaming is not supported by the selected model. Disabling streaming.")
+            args.stream = False
+
         coder = Coder.create(
             main_model=main_model,
             edit_format=args.edit_format,