## Description
Adds a card at the end of the rows on the discover page/tab to view more
results. When clicking this card, it goes to a grid view of more results
starting focused on the next one.
### Dev notes
This PR modifies `ApiRequestPager` to move most of its functionality
into an abstract class, `RequestPager`. And then add a new concrete
class, `DiscoverRequestPager`, for Seerr API paging. `ApiRequestPager`
remains for Jellyfin paging.
### Related issues
Related to #1035
### Testing
Emulator
## Screenshots
## AI or LLM usage
None
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