fix: update character selection dialog (#336)

lib/select_character/view/character_selection_page.dart

@@ -65,7 +65,8 @@ class _CharacterGrid extends StatelessWidget {
         return Row(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
-            Column(
+            Expanded(
+              child: Column(
                 children: [
                   _Character(
                     key: const Key('sparky_character_selection'),
@@ -80,8 +81,10 @@ class _CharacterGrid extends StatelessWidget {
                   ),
                 ],
               ),
+            ),
             const SizedBox(width: 6),
-            Column(
+            Expanded(
+              child: Column(
                 children: [
                   _Character(
                     key: const Key('dash_character_selection'),
@@ -96,6 +99,7 @@ class _CharacterGrid extends StatelessWidget {
                   ),
                 ],
               ),
+            ),
           ],
         );
       },