Improve formulation builder disabled-state accessibility

[BigSimmo]

Summary

Replays the #064 formulation disabled-control accessibility fix on current main after conflicted PRs #1219, #1223, #1226, and #1231 were closed.

• Replace disabled:opacity-* on Previous/Continue with explicit token surfaces (disabled:border, disabled:bg-[color:var(--surface-inset)], muted text/shadow for Continue)
• Keep native disabled so unavailable nav rejects focus and stays opacity 1
• Add Playwright coverage for native-disabled state, opacity, focus rejection, and axe cleanliness; keep the re-enabled Previous opacity guard in the draft journey
• Update #064 disposition and append one branch-review ledger row

Historical agent/formulation-disabled-contrast remains unrecovered/untouched.

RAG impact: no retrieval behaviour change — formulation UI disabled styling and Playwright coverage only

Verification

• npm run verify:pr-local (running after PR open)
• focused Chromium tests/ui-formulation.spec.ts (running after PR open)
• UI verification not run yet: full verify:ui deferred to hosted Production UI; local managed browsers may be incomplete in this environment
• Verification not run: provider-backed / release gates (not required for this UI-only change)

Risk and rollout

• Risk: Low — styling + test-only change to formulation builder step nav
• Rollback: Revert the squash commit; previous opacity utilities return
• Provider or production effects: None

Notes

• Apply and keep skip-branch-sync
• Do not merge main into this branch after open
• Squash-merge only when GitHub reports MERGEABLE and required checks are green
• Do not merge closed PRs #1219 / #1223 / #1226 / #1231

  

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Review details

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Run ID: 70b9dc40-97c8-4c54-870d-d240262ebb62

📥 Commits

Reviewing files that changed from the base of the PR and between 3c048fe and f5b16ca.

📒 Files selected for processing (4)

• docs/branch-review-ledger.md
• docs/outstanding-issues.md
• src/components/formulation/formulation-builder-page.tsx
• tests/ui-formulation.spec.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/formulation-a11y-replay-14d4

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