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/components/studyBrowser/index.js

@@ -1,2 +1,2 @@
 export { StudyBrowser } from './StudyBrowser.js';
-export { ThumbnailEntry } from './ThumbnailEntry.js';
+export { Thumbnail } from './Thumbnail.js';