Use node for dropzone dependencies

How we include dropzone is not great right now, because we have to update it elsewhere and it would be cool if we didn't have to do that. And we have node in the project and it's not leaving anytime soon so I think it doesn't hurt

Also sonarqube whines about not having integrity checks on the sources which is very valid

該 issue 沒有說明目前如何引入 dropzone，也沒有提到任何測試。首先定位目前引入 dropzone 的方式，並檢查專案現有的 Node 設定；然後確定應如何處理相依性更新和 SonarQube 完整性檢查。當 dropzone 透過 Node 進行管理且原始碼完整性警告獲得解決時，即視為完成。

由索引模型根據 Issue 內容生成。