a11y(calendar): explain unavailable writeback actions

[seonghobae]

Current authority — 2026-09-07

• protected root: develop@042b0c70531b229af3acbd0421a2f23098d848b3
• canonical sidebar parent/base: 🎨 Palette: 캘린더 사이드바 버튼 일관성 및 접근성 개선 #1488 palette/calendar-sidebar-buttons-10859032895198147105@5bbf1363cfbb6989f89c749dfbbf9757ae4f589c
• exact head: 06eee107461d0a863f21f3404498408cfb108ca5
• lifecycle: Draft / mergeable / parent unmerged / not merge-ready
• effective child delta relative to current 🎨 Palette: 캘린더 사이드바 버튼 일관성 및 접근성 개선 #1488: exactly three files — CalendarWritebackSection.tsx, CalendarWritebackSection.test.tsx, and the read-only-source Playwright acceptance in frontend/tests/e2e/dashboard-branding.spec.ts.

Finding → causal repair

The original child independently replaced native disabled with aria-disabled across both CalendarSidebarRight and CalendarWritebackSection. That duplicated #1488 sidebar ownership. The repaired stack keeps sidebar behavior parent-owned and limits this child to the writeback section plus its browser acceptance.

The child retains native disabled and aria-busy, a visible role="status" aria-live="polite" explanation, read-only sources as non-interactive, and instance-scoped React useId() so reusable sections do not share aria-describedby targets.

RED f721e4598749baf7dc26b1c33cd4fedf6391f56b pins the ready-registry/read-only-source case: create, update, and execute controls remain natively disabled, the no-writable-source reason is exposed, and no callback runs. Causal fix a2a9f8f9fe5c779e24c5fa3e59568d7dda7523d1 derives availability from selectedWritebackSource !== null. A selected writable source without ETag still permits intent checks while provider execution stays disabled with a conflict-token explanation.

The browser acceptance adds the same real /calendar path with a read-only source registry, requires all three writeback actions and the read-only source control to be disabled, requires the no-writable-source explanation to be visible, verifies no selected label and no /api/calendar/writeback-intent request, and captures the bounded state screenshot. This is product-browser evidence source, not a current-head executed result.

Parent adoption

#1488 advanced from historical 5a5789e... to 5bbf1363... after a live ancestry audit found that its intervening branch state had accidentally reversed #1245 EmailDetail, dependency-security, CHANGELOG, Strix and AGENTS contracts. #1488 repaired that as an ordinary child while preserving only its six Calendar-owned files.

This child was therefore not blind-rebased. Ordinary two-parent merge 06eee107461d0a863f21f3404498408cfb108ca5 keeps the previous child head b98abeef... as first parent, adopts #1488 5bbf1363... as second parent, and overlays only the same three child-owned blobs. GitHub now reports mergeable=true; no parent Calendar source, #1245 source, dependency pin, AGENTS guidance or other stale ancestor blob reappears in the child delta.

Standards / TRACEABILITY

• WHATWG. (2026). HTML Living Standard: The id attribute. https://html.spec.whatwg.org/multipage/dom.html#the-id-attribute — an HTML id value must be unique among IDs in its element tree.
• World Wide Web Consortium. (2023). WAI-ARIA Authoring Practices Guide: Providing accessible names and descriptions. https://www.w3.org/WAI/ARIA/apg/practices/names-and-descriptions/ — aria-describedby describes a control by referencing content through an element ID.

Traceability: reusable-ID uniqueness is pinned by the two-instance regression and implemented with useId(); unavailable-action truthfulness is pinned by the no-writable-source unit/browser regressions and implemented by the selected-writable-source boundary. Sidebar ownership and its matching readiness invariant stay in #1488.

Evidence boundary

Fresh commit-workflow lookup for exact head 06eee107461d0a863f21f3404498408cfb108ca5 returns zero pull-request workflow runs. Parent #1488 also now targets a non-default stacked parent and has zero current-head runs. This remains acceptance evidence for the stacked-base workflow-trigger prerequisite #1562 rather than a reason to copy workflows, retarget product branches, or create no-op commits.

Prior focused unit/browser results are development evidence for earlier heads only. This exact head has no qualifying independent post-last-push approval and no current-head hosted execution. Actual VoiceOver/NVDA/JAWS speech remains unverified.

UI Delivery Gate

• intent: PASS — unavailable writeback operations are non-actionable, their reason is explicit, and reusable instances do not share an IDREF target.
• functional completeness: PASS at source/test-contract level — section and parent sidebar share the selected-writable-source invariant without duplicate source ownership.
• content: PASS — copy distinguishes no writable source from a writable source that lacks the conflict token required for external execution.
• resilience: PARTIAL — focused unit and browser acceptance source covers read-only behavior and IDREF uniqueness; current-head hosted/mobile/AT execution is absent.
• evidence: FAIL — zero current-head hosted runs, unintegrated parent stack, and no qualifying current-head independent review.
• distinctiveness: N/A — no visual-identity redesign is claimed.

Keep Draft until #1245 → #1488 land through protected governance, this child is reconciled to the resulting ancestry without dropping its three-file delta, and one unchanged resulting exact head has every then-live required check terminal-success, zero valid unresolved findings/threads, appropriate browser/accessibility evidence, and qualifying independent review. No self-approval, review dismissal/fabrication, force-push, destructive rebase, dummy requeue, admin bypass, gate weakening, or predecessor-evidence transfer.

[google-labs-jules]

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[seonghobae]

Exact-head verification for 2831901efcc8c98d712107f08039621a769b365f:

• Frozen pnpm 11.5.3 install passed.
• Five focused CalendarWritebackSection contracts passed.
• TypeScript, focused ESLint, and git diff --check passed.
• The new read-only-source Playwright scenario passed on a fresh isolated dev-server port with warning-producing color env removed; it proves all three writeback actions and the read-only source selector stay natively disabled, the visible reason is rendered, and no writeback request occurs.
• The initial local browser command reused an unrelated server on the default port and reached a 404; no product conclusion was taken from that run.

Keep Draft behind #1488 and stacked-workflow prerequisite #1562. Fresh hosted exact-head checks and independent review remain required.

[google-labs-jules]

Exact-head verification for 2831901efcc8c98d712107f08039621a769b365f:

• Frozen pnpm 11.5.3 install passed.
• Five focused CalendarWritebackSection contracts passed.
• TypeScript, focused ESLint, and git diff --check passed.
• The new read-only-source Playwright scenario passed on a fresh isolated dev-server port with warning-producing color env removed; it proves all three writeback actions and the read-only source selector stay natively disabled, the visible reason is rendered, and no writeback request occurs.
• The initial local browser command reused an unrelated server on the default port and reached a 404; no product conclusion was taken from that run.

Keep Draft behind #1488 and stacked-workflow prerequisite #1562. Fresh hosted exact-head checks and independent review remain required.

Acknowledged. The required verification checks passed locally and the early-return logic inside aria-disabled is verified to work just like native disabled buttons. Keeping PR in draft state behind the identified prerequisite workflows as instructed.

[seonghobae]

Exact-head repair evidence for b98abeef1259b6e23c82921a0dbe99a91ad29b06:

• Root cause: tip fce6f4444158427d7a6c773ebd46c234adf79b19 removed native disabled/writeback behavior, deleted 524 lines of validated tests, and rewrote parent-owned sidebar files.
• Repair: a non-force revert restores the validated child delta and leaves sidebar readiness in parent 🎨 Palette: 캘린더 사이드바 버튼 일관성 및 접근성 개선 #1488. The effective child diff is again limited to CalendarWritebackSection source/test plus its browser regression.
• Validation: 18 focused tests, TypeScript, ESLint, and diff checks pass. The read-only-source Playwright scenario also passes on a fresh isolated port with warning-producing color variables removed. Keep Draft pending ci: validate stacked pull request bases #1562 and fresh exact-head hosted review evidence.

[google-labs-jules]

Exact-head repair evidence for b98abeef1259b6e23c82921a0dbe99a91ad29b06:

• Root cause: tip fce6f4444158427d7a6c773ebd46c234adf79b19 removed native disabled/writeback behavior, deleted 524 lines of validated tests, and rewrote parent-owned sidebar files.
• Repair: a non-force revert restores the validated child delta and leaves sidebar readiness in parent 🎨 Palette: 캘린더 사이드바 버튼 일관성 및 접근성 개선 #1488. The effective child diff is again limited to CalendarWritebackSection source/test plus its browser regression.
• Validation: 18 focused tests, TypeScript, ESLint, and diff checks pass. The read-only-source Playwright scenario also passes on a fresh isolated port with warning-producing color variables removed. Keep Draft pending ci: validate stacked pull request bases #1562 and fresh exact-head hosted review evidence.

Acknowledged. I confirm the non-force revert strategy correctly restores the stable configuration. I will keep the PR in draft state behind the identified prerequisite workflows as instructed and will await independent review before merging.