remove haptic feedback on iOS (#1047)

lib/pages/chat/chat.dart

@@ -1719,9 +1719,7 @@ class ChatController extends State<ChatPageWithRoom>
     // select the message
     onSelectMessage(pangeaMessageEvent.event);
     if (!kIsWeb) {
-      Platform.isAndroid
-          ? HapticFeedback.mediumImpact()
-          : HapticFeedback.vibrate();
+      HapticFeedback.mediumImpact();
     }
   }
 

lib/pangea/widgets/chat/message_toolbar_buttons.dart

@@ -1,4 +1,3 @@
-import 'dart:io';
 import 'dart:math';
 
 import 'package:collection/collection.dart';
@@ -193,9 +192,7 @@ class DisabledAnimationState extends State<DisabledAnimation>
           onTap: () {
             _controller.forward().then((_) => _controller.reset());
             if (!kIsWeb) {
-              Platform.isAndroid
-                  ? HapticFeedback.mediumImpact()
-                  : HapticFeedback.vibrate();
+              HapticFeedback.mediumImpact();
             }
           },
           child: SizedBox(

lib/pangea/widgets/pressable_button.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-import 'dart:io';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -64,9 +63,7 @@ class PressableButtonState extends State<PressableButton>
     }
     if (mounted) _controller.reverse();
     if (!kIsWeb) {
-      Platform.isAndroid
-          ? HapticFeedback.mediumImpact()
-          : HapticFeedback.vibrate();
+      HapticFeedback.mediumImpact();
     }
   }