Problem:
Currently, Kanban tasks only support text in the body. There's no way to attach files (PDFs, images, documents) to tasks.

Use case:
I use Kanban to manage PDF translation projects. Workers need access to source files. Right now I have to:
1. Put file path in task description
2. Hope the worker can find it

Requested feature:
- Upload button in task creation/editing UI
- Support for PDF, images, text files
- Files stored in task attachments
- Workers can download/view attached files

Alternative:
If full upload is complex, maybe allow pasting file paths that auto-link to the file manager?

Thanks!