Showcase: convert integration tests to gts/gjs

[shleewhite]

📌 Summary

If merged, this PR updates the component integration tests to use the gts format.

The commits in the PR are organized as follows:

• run the automation to convert most the tests to gjs (there were a couple that couldn't be automatically converted)
• add any required devDeps to the showcase to type the tests
• 1 commit per component where the tests are converted from gjs to gts

The changes include:

• converting the tests to typescript, which ensures tests are using components correctly
• switching from hbs wrapper around what the test renders, instead using <template> tags
• using TrackedObject/Array instead of this.set()
• moving away from using beforeEach for setting global values and instead defining things within the individual test context
• I broke up the AdvancedTable index test file into several feature files that are sub-modules of advanced-table/index (this was just to make the file more understandable)
• standardized how repeated components are rendered, using the precedent set by stepper and tabs (see advanced table, keyvalueinputs, table for examples)
• added imports for sinon, codemirror in the showcase so tests can be typed correctly

UPDATE
To make the ember matrix tests pass, I had to update the gjs test files to not use this.set anymore.

REVIEWERS
Using the order of commits, you can click the link for the commit of the first component you are supposed to look at and then step through

• Alex: Accordion -> Card
• Cristiano: CodeBlock -> Form FileInput
• Dylan: Form KeyValueInputs -> Interactive
• Kristin: Layout -> Stepper
• Zack: Table -> AppSideNav

If your section is looking good - please throw an approval on this PR, otherwise leave a comment.

🔗 External links

Jira ticket: HDS-XXX

---

👀 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.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Updated (UTC)
hds-showcase	Ready	Preview	Nov 19, 2025 2:26pm
hds-website	Ready	Preview	Nov 19, 2025 2:26pm

[KristinLBradley]

Should the onClick and isSelected arguments be updated in the component definition to set a default or something so they won't be left missing like they were previously? (Since this now uses typescript and the arguments aren't defined as optional in the component definition, I guess that's already the case though?)

[KristinLBradley]

Nice! Syntax is clearer

[KristinLBradley]

Left a number of comments and a couple suggested changes for typos/clarification

[KristinLBradley]

Looking good!