word_search: add button to clear content in search bar

docs/changelog/v0.4.0.md

@@ -10,6 +10,7 @@
 - Added a bubble in the top bar of word search results to indicate how many times it has been searched before.
 - Added basic support for Android's [Predictive Back](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back) feature.
 - Allow inline expansion of antonyms "See also" references in the word search results.
+- Added a button to clear the content of the search bar in the word query view.
 
 ## Changes 🔧
 

lib/components/search/global_search_bar.dart

@@ -52,8 +52,15 @@ class GlobalSearchBar extends StatelessWidget {
           ),
           const SizedBox(height: 20),
           Row(
-            mainAxisAlignment: MainAxisAlignment.center,
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: [
+              IconButton(
+                icon: const Icon(Icons.close),
+                color: Colors.red,
+                onPressed: () {
+                  textController.clear();
+                },
+              ),
               const LanguageSelector(),
               IconButton(
                 icon: const Icon(Icons.mode),