Fix: Resolve AttributeError in CTkSwitch and ensure initial dark mode

gui.py

@@ -37,6 +37,7 @@ class VideoConverterGUI:
         # anchor="w" (west) aligns it to the left
         self.mode_switch.pack(pady=10, padx=20, anchor="w")
         self.mode_switch.select() # Start in the "on" (Dark) state
+        self.toggle_mode() # Ensure initial mode is set based on switch state
 
         # --- Main Widgets ---
         self.label = customtkinter.CTkLabel(master, text="Select video file or enter URL:")
@@ -88,7 +89,7 @@ class VideoConverterGUI:
 
     def toggle_mode(self):
         # Check if the switch is on (1) or off (0)
-        if self.mode_switch.is_selected():
+        if self.mode_switch.get() == 1:
             customtkinter.set_appearance_mode("Dark")
         else:
             customtkinter.set_appearance_mode("Light")