Enhance Document Preview Functionality for Instructors

[rabeatwork]

Description:
Currently, the system only allows users to see a small preview of documents (e.g., Leistungsnachweis, CV) or to directly download them. As an instructor, it would be highly beneficial to have the option to open these documents in a larger, more detailed preview without the need to download them first. This could be achieved by providing an option to open an enlarged preview when clicking on a document.

Why is this needed?

• Improves workflow efficiency by avoiding unnecessary downloads.
• Enables faster evaluation and feedback on submitted documents.
• Provides a more seamless and user-friendly experience.