Showcase: convert Pagination page to gts

[shleewhite]

📌 Summary

If merged, this PR would convert the pagination showcase page to gts.

This page is one of the few examples where we need to keep the controller file because it uses queryParams in 2 of the demos. An unexpected benefit of breaking up the page into sub-components means these demos are actually more in line with how consumers implement these UIs.

The source of truth for the state is in the URL, the controller only contains the list of queryParams + tracked copy of the param. Then in the component, when something (like page size) changes, you transition to the same URL and update the appropriate params which causes the tracked state in the controller to change and then makes the component re-render.

Passing the controller to the sub components is the easiest way to get the current state of the query params to the appropriate place.

Note: I had to update the acceptance tests a bit to match the new query param names + ids.

🔗 External links

Jira ticket: HDS-5348

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👀 Component checklist

• Percy was checked for any visual regression

💬 Please consider using conventional comments when reviewing this PR.

📋 PCI review checklist

• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've worked with GRC to document the impact of any changes to security controls.
  Examples of changes to controls include access controls, encryption, logging, etc.
• If applicable, I've worked with GRC to ensure compliance due to a significant change to the in-scope PCI environment.
  Examples include changes to operating systems, ports, protocols, services, cryptography-related components, PII processing code, etc.

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Project	Deployment	Preview	Updated (UTC)
hds-showcase	Ready	Preview	Oct 9, 2025 5:28pm
hds-website	Ready	Preview	Oct 9, 2025 5:28pm