Add .har file support for OpenaiChat

Update model list of HuggingChat
Update styles of scrollbar in gui
Fix image upload in gui

g4f/gui/server/api.py

@@ -135,6 +135,7 @@ class Api():
         camera.take_picture(filename=filename, on_complete=self.on_camera)
 
     def on_image_selection(self, filename):
+        filename = filename[0] if isinstance(filename, list) else filename
         if filename is not None and os.path.exists(filename):
             self.image = filename
         else:
@@ -152,7 +153,7 @@ class Api():
         window = webview.windows[0]
         if window is not None:
             window.evaluate_js(
-                f"document.querySelector(`.file-label.selected`)?.classList.remove(`selected`);"
+                f"document.querySelector(`.image-label.selected`)?.classList.remove(`selected`);"
             )
             if input_id is not None and input_id in ("image", "camera"):
                 window.evaluate_js(