fix: pre release (#324)

* use share_plus plugin

* bump dependency versions

* fix ui for web

* unfocus messageinput only on commands

* fix default error for messagesearchlistview

* fix thumbnail animation

packages/stream_chat_flutter/lib/src/quoted_message_widget.dart

@@ -55,7 +55,7 @@ class _VideoAttachmentThumbnailState extends State<_VideoAttachmentThumbnail> {
     return Container(
         height: widget.size.height,
         width: widget.size.width,
-        child: _controller.value.initialized
+        child: _controller.value.isInitialized
             ? VideoPlayer(_controller)
             : CircularProgressIndicator());
   }