Unblock the migration of the per rail, per account, and per operator pages to the new UI library

We are currently migrating from `@filecoin-pay/ui` to `@filecoin-foundation/ui-filecoin`.
Most pages have already been updated using a combination of both libraries because `@filecoin-foundation/ui-filecoin` does not yet provide all required components.

**Task**

Migrate the remaining three pages:

- Per Rail
- Per Account
- Per Operator

Use the already-migrated pages as references to understand:

1. Which components need to be replaced or shimmed,
2. What patterns we are using for combining the two libraries,
3. Any layout or style differences introduced by the new library.