Conditionally set window properties for desktop builds

app/src-tauri/src/lib.rs

···
 			};
 
 			// create and open window directly at the correct page
-			WebviewWindowBuilder::new(app_handle, "main", WebviewUrl::App(page.into()))
-				.title("privacypin")
-				.inner_size(412.0, 715.0)
-				.resizable(false)
-				.build()?;
+			let builder =
+				WebviewWindowBuilder::new(app_handle, "main", WebviewUrl::App(page.into()));
+
+			// only for desktop to emulate mobile size (for testing)
+			#[cfg(desktop)]
+			let builder = builder.title("privacypin").inner_size(412.0, 715.0).resizable(false);
+
+			builder.build()?;
 
 			Ok(())
 		})