Limit getFolderContent for File Listing

### How to use GitHub

* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are interested into the same feature.
* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
* Subscribe to receive notifications on status change and new comments.

Currently, `FileDao.getFolderContent` retrieves all `FileEntity` records from the database, and it used for file listing. Instead, for file listing it should only fetch the first n visible items, with additional items loaded via scroll functionality on demand.

This will improve performance and reduce unnecessary data loading.