restrict width of missing voice button

lib/pangea/widgets/chat/missing_voice_button.dart

@@ -40,7 +40,10 @@ class MissingVoiceButton extends StatelessWidget {
       ),
       padding: const EdgeInsets.all(8),
       margin: const EdgeInsets.only(top: 8),
+      child: SizedBox(
+        width: AppConfig.toolbarMinWidth,
         child: Column(
+          mainAxisSize: MainAxisSize.min,
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
             Text(
@@ -58,6 +61,7 @@ class MissingVoiceButton extends StatelessWidget {
             ),
           ],
         ),
+      ),
     );
   }
 }