### What?
Fixes the issue with passing a string `limit` value from user
preferences to the mongodb `.aggregate` function.
To reproduce:
- click the list view for a collection that has a join field
- set "show per page" to 100
- reload, see this:
<img width="1001" alt="image"
src="https://github.com/user-attachments/assets/86c644d1-d183-48e6-bf34-0ccac23cb114">
### Why?
When using `.aggregate`, MongoDB doesn't cast a value for the `$limit`
stage to a number automatically as it's not handled by Mongoose. It's
also more convenient to store this value as a number.
### How?
Stores `limit` inside of preferences in number.
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