feat(ui): Add pagination to books pages and improve spacing

- Added CursorPagination component with page size selector (20/50/100)
- Updated /books page with pagination support
- Updated /libraries/[id]/books with pagination
- Improved layout margins (added pb-16 and responsive px)
- Series page uses improved layout spacing

apps/backoffice/app/components/ui/index.ts

@@ -6,3 +6,4 @@ export { Button } from "./Button";
 export { Input, Select } from "./Input";
 export { FormField, FormLabel, FormInput, FormSelect, FormRow } from "./Form";
 export { PageIcon, NavIcon } from "./Icon";
+export { CursorPagination, OffsetPagination } from "./Pagination";