[a11y] WCAG 4.1.2 — add label prop to Button primitive and enforce accessible names

[rosanusi]

Summary

• Adds a label?: string prop to BaseProps in the Button primitive (src/lib/holocene/button.svelte) rendered as aria-label on both the <a> anchor branch and <button> branch
• Adds a dev-time onMount check that throws (dev) or console.errors (prod) when a button is rendered without any accessible name (no label, aria-label, aria-labelledby, title, slot text, leading/trailing icon, or count badge)
• Updates 7 consumer call-sites that were triggering the defect: Workflows List (per-row Start button + 3 toolbar buttons), Activities List (per-row Start button), Schedules List (toolbar configure-columns button), and Schedule Detail page (refresh button)
• Adds configure-columns i18n key to src/lib/i18n/locales/en/common.ts

Affected files

• src/lib/holocene/button.svelte
• src/lib/i18n/locales/en/common.ts
• src/lib/components/workflow/start-workflow-button.svelte
• src/lib/components/standalone-activities/start-activity-button.svelte
• src/lib/components/workflow/workflows-summary-configurable-table.svelte
• src/lib/pages/schedule-view.svelte
• src/lib/pages/schedules.svelte

Test plan

• Visual regression: all 7 consumer buttons render and function identically; no visible change
• Screen reader (NVDA/VoiceOver): each button announces its label before activation
• Dev-mode enforcement: render a <Button> with no name source — confirm it throws; add label="…" — confirm no throw
• Anchor branch: render <Button href="…"> with no name source — confirm same enforcement fires
• Count badge: render <Button count={3}> — confirm enforcement does not fire (count provides a numeric name)
• pnpm check passes (no new type errors beyond pre-existing $$_$$ slot interop errors on main)

A11y-Audit-Ref: 4.1.2-button-anchor-empty

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Jun 12, 2026 2:18pm

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 25 errors in 2 files (2.8% of 904 total) src/lib/holocene/button.svelte (6) L111:13: Type 'null' is not assignable to type '"search" | "link" | "success" | "error" | "action" | "activity" | "add-square" | "add" | "apple" | "archives" | "arrow-down" | "arrow-left" | "arrow-up" | "arrow-right" | "ascending" | ... 141 more ... | "xmark-square"'. L112:13: Type 'null' is not assignable to type '"search" | "link" | "success" | "error" | "action" | "activity" | "add-square" | "add" | "apple" | "archives" | "arrow-down" | "arrow-left" | "arrow-up" | "arrow-right" | "ascending" | ... 141 more ... | "xmark-square"'. L114:13: Type 'null' is not assignable to type 'string'. L115:13: Type 'null' is not assignable to type 'string'. L116:13: Type 'null' is not assignable to type 'string'. L104:7: Argument of type '$$Props' is not assignable to parameter of type '{ variant?: "primary" | "secondary" | "ghost" | "destructive" | "table-header" | null | undefined; size?: "xs" | "sm" | "md" | "lg" | null | undefined; disabled?: boolean | undefined; ... 10 more ...; class?: string | undefined; }'. src/lib/pages/schedule-view.svelte (19) L138:18: Property 'message' does not exist on type '{}'. L300:20: 'schedule.schedule' is possibly 'undefined'. L300:20: 'schedule.schedule.state' is possibly 'null' or 'undefined'. L401:12: Type 'IScheduleActionResult[] | null | undefined' is not assignable to type 'IScheduleActionResult[] | undefined'. L405:12: Type 'ITimestamp[] | null | undefined' is not assignable to type 'ITimestamp[] | undefined'. L408:12: Type 'IScheduleSpec | null | undefined' is not assignable to type 'IScheduleSpec'. L409:12: Type 'IScheduleState | null | undefined' is not assignable to type 'IScheduleState'. L410:12: Type 'ISchedulePolicies | null | undefined' is not assignable to type 'ISchedulePolicies'. L411:12: Type 'string | null | undefined' is not assignable to type 'string | undefined'. L420:12: Type 'IPayloads | null | undefined' is not assignable to type 'IPayloads'. L422:34: Type 'IScheduleSpec | null | undefined' is not assignable to type 'IScheduleSpec'. L430:19: 'schedule.schedule' is possibly 'undefined'. L430:19: 'schedule.schedule.state' is possibly 'null' or 'undefined'. L439:9: 'schedule.schedule' is possibly 'undefined'. L439:9: 'schedule.schedule.state' is possibly 'null' or 'undefined'. L445:11: 'schedule.schedule' is possibly 'undefined'. L445:11: 'schedule.schedule.state' is possibly 'null' or 'undefined'. L454:11: 'schedule.schedule' is possibly 'undefined'. L454:11: 'schedule.schedule.state' is possibly 'null' or 'undefined'.

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