chore(icons): add workflow icons generator

[cdransf]

Description

Adds scripts/generate-workflow-icons.mjs: converts A4U workflow SVGs into a per-icon function (StarIcon(): string) and a per-icon element (<swc-icon-star> extending IconBase), reusing Phase 0's shared icon-source/utils/. Staged in swc/components/workflow-icons/ for now; packaging into @adobe/spectrum-wc-icons is Phase 4. Filename regex (S2_Icon_<Name>_20_N.svg) is derived from a public sibling repo's manifest, not a confirmed real A4U sample, flagged as such in the file header. Validated against synthetic fixtures only; no real icon art is included or committed.

Motivation and context

Implements Phase 3 of the icon RFC (SWC-2442): public workflow icons as a Lit-free function plus a custom element.

Related issue(s)

• Jira: SWC-2442
• Depends on SWC-2439 (Phase 2 gate) · feeds SWC-2441 (Phase 4 packaging)

Screenshots (if appropriate)

N/A — build script only, no UI.

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed the Accessibility Practices for this feature.
• 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

Manual review test cases

• Drop a fixture SVG (S2_Icon_Star_20_N.svg, --iconPrimary fill) into icon-source/workflow/, run yarn generate:workflow-icons, confirm both output files are generated, fill is rewritten to var(--swc-icon-color, currentColor), and lint/prettier pass. Delete the fixture and output after.
• Confirm running with an empty icon-source/workflow/ throws instead of deleting anything.

Device review

• Did it pass in Desktop?
• Did it pass in (emulated) Mobile?
• Did it pass in (emulated) iPad?

Accessibility testing checklist

• Keyboard: N/A, no UI in this PR.
• Screen reader: N/A, no UI in this PR. Generated elements extend IconBase (existing, already-tested a11y contract: decorative by default, role="img" + aria-label when accessible-label is set); no new behavior introduced.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1f31550

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

📚 Branch Preview Links

• Storybook (Gen2, dev mode)
• Storybook (Gen2, prod mode)
• Documentation Site (Gen1)
• Storybook (Gen1)

🔍 Gen1 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-6572

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.