chore: address barebones feedback

[rubencarvalho]

Description

Addressed barebones review feedback. Notably:

1. Documentation updates
2. Custom HMR plugin that invalidates affected component modules when CSS files change in 2nd-gen
3. Lint job fix in CI

Even though I fixed some paths related to the Performance tests, these are currently not working in main and will be addressed in post-barebones.

Motivation and context

During the barebones MVP review, feedback indicated that the PR needed some fixes. This addresses that.

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

---

Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9142efb

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[github-actions]

📚 Branch Preview

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🔍 Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

• Spectrum | Light | Medium | LTR
• Spectrum | Dark | Large | RTL
• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
• Spectrum-two | Light | Medium | LTR
• Spectrum-two | Dark | Large | RTL
• High Contrast Mode | Medium | LTR

Deployed to Azure Blob Storage: pr-5852

If the changes are expected, update the current_golden_images_cache hash in the circleci config to accept the new images. Instructions are included in that file.
If the changes are unexpected, you can investigate the cause of the differences and update the code accordingly.

[github-actions]

Tachometer results

Currently, no packages are changed by this PR...

[rise-erpelding]

I see that this is passing in CI, but locally, I'm still getting a lint error:

If I change this to:

Suggested change

	"templateFile": "config/HEADER.js"
	"templateFile": "../config/HEADER.js"

I can get it to run and it finds lint errors:

Should we address these?

[rubencarvalho]

I addressed this for now and pushed a commit with the --fixed files.
The more comprehensive linting fix will happen in: #5847
LMK if you still find something quirky!

[nikkimk]

lgtm