Fix compile issues for mobile

src-tauri/src/lib.rs

@@ -2,12 +2,18 @@ use tauri::{Manager, WebviewUrl, WebviewWindowBuilder};
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
-    tauri::Builder::default()
+    let mut builder = tauri::Builder::default();
-        .plugin(tauri_plugin_single_instance::init(|app, _args, _cwd| {
+
+    #[cfg(not(any(target_os = "android", target_os = "ios")))]
+    {
+        builder = builder.plugin(tauri_plugin_single_instance::init(|app, _args, _cwd| {
             if let Some(window) = app.get_webview_window("main") {
                 let _ = window.set_focus();
             }
-        }))
+        }));
+    }
+
+    let app = builder
         .plugin(tauri_plugin_os::init())
         .plugin(tauri_plugin_clipboard_manager::init())
         .invoke_handler(tauri::generate_handler![])
@@ -65,4 +71,6 @@ pub fn run() {
         })
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
+
+    let _ = app;
 }