refactor: Add code quality reports

lib/widgets/event_content/image_bubble.dart

@@ -113,8 +113,7 @@ class _ImageBubbleState extends State<ImageBubble> {
     }
   }
 
-  Widget frameBuilder(
-      BuildContext context, Widget child, int frame, bool sync) {
+  Widget frameBuilder(_, Widget child, int frame, __) {
     // as servers might return animated gifs as thumbnails and we want them to *not* play
     // animated, we'll have to store the first frame in a variable and display that instead
     if (widget.animated) {
@@ -249,7 +248,8 @@ class _ImageBubbleState extends State<ImageBubble> {
       children: <Widget>[
         if (blurhash != null) blurhash,
         Center(
-          child: child ?? const CircularProgressIndicator.adaptive(strokeWidth: 2),
+          child:
+              child ?? const CircularProgressIndicator.adaptive(strokeWidth: 2),
         ),
       ],
     );

lib/widgets/input_bar.dart

@@ -221,7 +221,8 @@ class InputBar extends StatelessWidget {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text('/' + command, style: const TextStyle(fontFamily: 'monospace')),
+            Text('/' + command,
+                style: const TextStyle(fontFamily: 'monospace')),
             Text(_commandHint(L10n.of(context), command),
                 style: Theme.of(context).textTheme.caption),
           ],
@@ -291,7 +292,7 @@ class InputBar extends StatelessWidget {
     return Container();
   }
 
-  void insertSuggestion(BuildContext context, Map<String, String> suggestion) {
+  void insertSuggestion(_, Map<String, String> suggestion) {
     final replaceText =
         controller.text.substring(0, controller.selection.baseOffset);
     var startText = '';