fix: 🐛 Fix ghost shadow on thumb (#1113)

* fix: 🐛 Fix ghost shadow on thumb

Updated react-dnd package for the lates. Refactored thumbnail component

Closes: 1087

* feat: 🎸 Code review

Set flex instead of float. Add cypress tag to thumb container

* feat: 🎸 Code review. Revised style when no description

platform/ui/src/index.js

@@ -17,9 +17,9 @@ import {
   StudyList,
   TableList,
   TableListItem,
+  Thumbnail,
   TableSearchFilter,
   TablePagination,
-  ThumbnailEntry,
   ToolbarSection,
   Tooltip,
   AboutModal,
@@ -86,9 +86,9 @@ export {
   StudyList,
   TableList,
   TableListItem,
+  Thumbnail,
   TableSearchFilter,
   TablePagination,
-  ThumbnailEntry,
   Toolbar,
   ToolbarButton,
   ToolbarSection,