Fix: keyboard visible even after search screen is dismissed

feature/search/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/search/SearchScreen.kt

@@ -443,11 +443,17 @@ private fun SearchToolbar(
     onBackClick: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
+    val keyboardController = LocalSoftwareKeyboardController.current
     Row(
         verticalAlignment = Alignment.CenterVertically,
         modifier = modifier.fillMaxWidth(),
     ) {
-        IconButton(onClick = { onBackClick() }) {
+        IconButton(
+            onClick = {
+                keyboardController?.hide()
+                onBackClick()
+            },
+        ) {
             Icon(
                 imageVector = NiaIcons.ArrowBack,
                 contentDescription = stringResource(