opt: dark theme, add follow system mode

src/ipc.rs

@@ -182,7 +182,7 @@ pub enum Data {
     #[cfg(not(any(target_os = "android", target_os = "ios", feature = "cli")))]
     Mouse(DataMouse),
     Control(DataControl),
-    Theme(bool),
+    Theme(String),
     Language(String),
     Empty,
 }