Improve UI around validation of the description for a collection item

We currently do not present an appropriate error/validation pattern for the UI when an editor adds a too long description for an item.

```
PrismaClientKnownRequestError: 
Invalid `prisma.submission.update()` invocation:


The provided value for the column is too long for the column's type. Column: (not available)
```

We could improve the validation here, to help QoL
