chore: Follow up image viewer swipe

lib/pages/image_viewer/image_viewer_view.dart

@@ -16,7 +16,7 @@ class ImageViewerView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final iconButtonStyle = IconButton.styleFrom(
-      backgroundColor: Colors.black.withAlpha(128),
+      backgroundColor: Colors.black.withAlpha(200),
       foregroundColor: Colors.white,
     );
     return GestureDetector(
@@ -96,6 +96,8 @@ class ImageViewerView extends StatelessWidget {
               if (hovered && controller.canGoBack)
                 Align(
                   alignment: Alignment.centerLeft,
+                  child: Padding(
+                    padding: const EdgeInsets.all(12.0),
                     child: IconButton(
                       style: iconButtonStyle,
                       icon: const Icon(Icons.chevron_left_outlined),
@@ -105,9 +107,12 @@ class ImageViewerView extends StatelessWidget {
                       ),
                     ),
                   ),
+                ),
               if (hovered && controller.canGoNext)
                 Align(
                   alignment: Alignment.centerRight,
+                  child: Padding(
+                    padding: const EdgeInsets.all(12.0),
                     child: IconButton(
                       style: iconButtonStyle,
                       icon: const Icon(Icons.chevron_right_outlined),
@@ -117,6 +122,7 @@ class ImageViewerView extends StatelessWidget {
                       ),
                     ),
                   ),
+                ),
             ],
           ),
         ),