fix(single-instance): forward non-Unicode arguments and cwd (#3644)

* Update windows.rs

* Create single-instance-non-unicode-args.md

* fix on linux and windows too

---------

Co-authored-by: Lucas Nogueira <lucas@tauri.app>

plugins/single-instance/src/platform_impl/windows.rs

@@ -86,9 +86,12 @@ pub fn init<R: Runtime>(callback: Box<SingleInstanceCallback<R>>) -> TauriPlugin
                         }
 
                         let cwd = std::env::current_dir().unwrap_or_default();
-                        let cwd = cwd.to_str().unwrap_or_default();
+                        let cwd = cwd.to_string_lossy();
 
-                        let args = std::env::args().collect::<Vec<String>>().join("|");
+                        let args = std::env::args_os()
+                            .map(|arg| arg.to_string_lossy().into_owned())
+                            .collect::<Vec<String>>()
+                            .join("|");
 
                         let data = format!("{cwd}|{args}\0",);