Add native file picker to core test UI

androidApp/src/main/kotlin/com/vnidrop/app/MainActivity.kt

@@ -6,11 +6,13 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.tooling.preview.Preview
+import com.vnidrop.app.core.attachAndroidFilePickerContext
 
 class MainActivity : ComponentActivity() {
 	override fun onCreate(savedInstanceState: Bundle?) {
 		enableEdgeToEdge()
 		super.onCreate(savedInstanceState)
+		attachAndroidFilePickerContext(this)
 
 		setContent {
 			App()