Drag and Drop for files in chats

[Comet1903]

Is your feature request related to a problem? Please describe.
Uploading files in Nextcloud Talk currently requires multiple clicks and selecting files manually through the Finder/Files app.

Describe the solution you'd like
Files should be uploadable via Drag and Drop (dragging and dropping them directly into the chat window), making the process faster and more intuitive.

Describe alternatives you've considered

• Using the existing upload button.

Additional context
Drag-and-drop for file upload is a standard feature in modern chat tools and would significantly improve the user experience.