feat(folio): testTag LoginScreen

examples/folio/composeApp/src/commonMain/kotlin/app/folio/feature/auth/LoginScreen.kt

@@ -15,6 +15,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.unit.dp
 import app.folio.data.Repository
@@ -59,7 +60,7 @@ fun LoginScreen(onLoggedIn: (String) -> Unit) {
         onLoggedIn(user)
     }
 
-    Screen {
+    Screen(modifier = Modifier.testTag("LoginScreen")) {
         Spacer(Modifier.height(16.dp))
         Column(
             modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),