[Enhancement] Give visibility when assignment is past due on assignment page

**Current Behavior**
If an assignment is past due, the 'submit' button is inactive, but there is no explanation as to why. Without explanation, it seems like a bug.

![Image](https://github.com/user-attachments/assets/1174f521-0f72-430a-8869-da3a4aea4b51)

**Desired Behavior**
Designs coming