Fix: Changing styles doesn't trigger showcase to rebuild

[shleewhite]

📌 Summary

If merged, this PR would fix an issue where changing a component Sass file does not trigger the showcase to rebuild.

🛠️ Detailed description

The custom SCSS compilation plugin was compiling SCSS files outside of Rollup's module dependency graph. Since these files weren't imported via JavaScript's import statements, Rollup had no knowledge they existed and didn't watch them for changes.

This required an update to the existing sass compilation function to explicitly register SCSS files and their dependencies with Rollup's watch system.

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👀 Component checklist

• Percy was checked for any visual regression
• A changelog entry was added via Changesets if needed (see templates here)

💬 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	Actions	Updated (UTC)
hds-showcase	Ready	Preview	Mar 4, 2026 8:37pm
hds-website	Ready	Preview	Mar 4, 2026 8:37pm