Feat/test demo seed pagination contract

[AAdewunmi]

Summary

Adds and aligns demo-seed pagination contract coverage with the current ReturnHub project structure and seeded product surfaces.

Changes

• added pagination contract coverage for the deterministic demo seed flow
• updated the test to use seed_returnhub_demo
• switched imports to the current returns.models module
• updated seeded usernames to the current dot-style accounts such as ops.demo, customer.one, and merchant.one
• updated route usage to the current namespaced surfaces:
  • ops:queue
  • customer_portal:case_list
  • merchant_portal:case_list
• verified seeded case distribution supports page-two walkthroughs across ops, customer, and merchant surfaces
• asserted expected page-two count-line behavior on the current list routes

Behavior

The test now validates that the preferred demo seed creates enough deterministic data for multi-page walkthroughs and that the main seeded product surfaces can render page two successfully.

Why

This keeps the demo-seed pagination contract aligned with the project as it exists today rather than older route names, legacy seed commands, or outdated usernames. It also strengthens confidence that the documented demos and walkthroughs are supported by the seeded data.

Validation

The rewritten test covers:

• total seeded case volume
• per-customer and per-merchant seeded case counts
• page one and page two rendering for the ops queue
• page two rendering for customer and merchant list surfaces
• current route names and current seeded users

Result

The repository now has a demo-seed pagination test that matches the current application structure and supports the current multi-surface walkthrough flow.

Notes

• this change updates test coverage only
• no runtime behavior or seeded data generation logic was changed
• the test is aligned with the existing seed_returnhub_demo convention used elsewhere in the repo

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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