Updated the update system to support multi channels (stable / pre-release).

ptlinux/ui/components/theme.py

@@ -349,12 +349,13 @@ def configure_dashboard_style(root: Any, ttk: Any, launcher_ui_scale: float) ->
 		"Settings.TCombobox",
 		fieldbackground=[
 			("disabled", "#171412"),
+			("active", "#100d0c"),
 			("readonly", "#100d0c"),
 		],
 		background=[
 			("disabled", "#171412"),
 			("pressed", "#32251f"),
-			("active", "#2a201c"),
+			("active", "#191311"),
 			("readonly", "#191311"),
 		],
 		foreground=[