refactor(tauri): Improve builder initialization readability

The main application setup in src-tauri/src/main.rs has been refactored to enhance local variable scoping. By assigning the result of tauri::Builder::default() to a named variable, the code becomes clearer and more readable without changing runtime behavior.

src-tauri/src/main.rs

@@ -52,7 +52,7 @@ async fn main() {
         return;
     }
 
-    tauri::Builder::default()
+    let builder =tauri::Builder::default()
         .plugin(tauri_plugin_single_instance::init(|app, _, _| {
             #[cfg(desktop)]
             let _ = app