fix(showcase): adjust glint patch

[aklkv]

📌 Summary

It turns out I messed up my own patch during pnpm migration which broken type checking in showcase so this fixes it as well as correct configuration for ember-composable-helpers which didn't work correctly before. I add manual types for capitalize helper from now deprecated ember-cli-string-helpers, we should move to @ember/string but it's a bigger lift and easier to do when we move to single file components.

Another potential solution is to rename route components so we avoid collision with the classic pattern e.g. (this would require renaming all route references)

🛠️ Detailed description

📸 Screenshots

🔗 External links

Slack 🧵 : https://hashicorp.slack.com/archives/C05P1FMLP6U/p1748947829147119

---

💬 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 Git ↗︎

Name	Status	Preview	Updated (UTC)
hds-showcase	✅ Ready (Inspect)	Visit Preview	Jun 17, 2025 11:03am
hds-website	✅ Ready (Inspect)	Visit Preview	Jun 17, 2025 11:03am

[RobbieTheWagner]

I would highly recommend we rename the route and move the templates so we do not need to do the patch to workaround this.