Pagination for network details view

There's a lot of data on both nominators and validators that's being fetched to the frontend - to ensure usability, pagination is required for the network details view

Start by locating the network details view and the code that fetches nominator and validator data for the frontend. Trace how both lists are rendered and determine where pagination belongs. Done means the network details view remains usable while showing paginated nominators and validators instead of fetching all data at once.

Written by the indexing model from the issue text.