feat: wip message input

lib/src/message_input.dart

@@ -855,7 +855,10 @@ class MessageInputState extends State<MessageInput> {
   }
 
   Widget _buildIdleSendButton(BuildContext context) {
-    return IconTheme(
+    return SizedBox(
+      height: 24.0,
+      width: 24.0,
+      child: IconTheme(
         data:
             StreamChatTheme.of(context).channelTheme.messageInputButtonIconTheme,
         child: Padding(
@@ -873,11 +876,15 @@ class MessageInputState extends State<MessageInput> {
             ),
           ),
         ),
+      ),
     );
   }
 
   Widget _buildSendButton(BuildContext context) {
-    return IconTheme(
+    return SizedBox(
+      height: 24.0,
+      width: 24.0,
+      child: IconTheme(
         data:
             StreamChatTheme.of(context).channelTheme.messageInputButtonIconTheme,
         child: Center(
@@ -895,6 +902,7 @@ class MessageInputState extends State<MessageInput> {
             ),
           ),
         ),
+      ),
     );
   }