fix(a11y): info-and-relationships compliance (WCAG 1.3.1)

[bilal-karim]

Summary

Bundled SC 1.3.1 fixes (audit groups them per SC):

• NumberInput / Textarea — forward required to native element. Visual red-dot was already shown via <Label>, but native HTML required was missing, so AT users heard an optional-field announcement despite the visible indicator. One-line fix per primitive.
• RadioGroup — group semantics. Added role="radiogroup" and linked the optional description via aria-labelledby so AT users hear the group as a whole rather than each radio in isolation.
• Tables — scope="col" on every <th>. Workflow lists, schedule lists, workers, batch-operations, child/parent workflow relationships. Fixes WCAG technique H63. Includes the two reusable header-cell primitives so future configurable-table consumers get it for free.

Audit context

• WCAG 2.2 SC 1.3.1 Info and Relationships (Level A) — Moderate (forwarders / RadioGroup), Serious (table scope).
• Issue files: audit-output/issues/1.3.1-{number-input,textarea}-required-forwarding.md, 1.3.1-radio-group-role-and-labelling.md, 1.3.1-table-scope-attributes.md.
• Note: This PR unblocks 1.4.1-label-required-indicator.md which depends on the two forwarding fixes shipping first.

Files (14)

• src/lib/holocene/input/number-input.svelte — {required} on <input>
• src/lib/holocene/textarea.svelte — {required} on <textarea>
• src/lib/holocene/radio-input/radio-group.svelte — role + aria-labelledby wiring
• 11 table consumers — scope="col" on <th>

Test plan

• Focus a required NumberInput/Textarea (e.g. activity-options-update-drawer); screen reader announces "required".
• Empty-submit a form with a required field; native HTML validation blocks submit.
• Open a form using RadioGroup (schedule retention, start-workflow input encoding); screen reader announces ", radiogroup" when entering the first radio.
• On any data table page (/namespaces/<ns>/workflows, schedules, workers), navigate cells; AT announces column headers ("Status, column 1").
• pnpm exec playwright test tests/accessibility/ — axe rules aria-required-attr, aria-required-children, scope-attr-valid, td-has-header should not flag the touched surfaces.

🤖 Generated with Claude Code

A11y-Audit-Ref: 1.3.1-number-input-required-forwarding
A11y-Audit-Ref: 1.3.1-textarea-required-forwarding
A11y-Audit-Ref: 1.3.1-radio-group-role-and-labelling
A11y-Audit-Ref: 1.3.1-table-scope-attributes

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	May 29, 2026 8:01pm

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 16 errors in 4 files (1.8% of 895 total) src/lib/holocene/textarea.svelte (1) L29:13: Type 'null' is not assignable to type 'boolean'. src/lib/holocene/input/number-input.svelte (3) L9:13: 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" | ... 140 more ... | "xmark-square"'. L20:13: Type 'undefined' is not assignable to type 'number'. L21:13: Type 'undefined' is not assignable to type 'number'. src/lib/components/workflow/child-workflows-table.svelte (6) L36:15: 'c.attributes.workflowExecution' is possibly 'null' or 'undefined'. L37:20: 'c.attributes.workflowExecution' is possibly 'null' or 'undefined'. L79:14: Type 'string | null | undefined' is not assignable to type 'string'. L80:14: Type 'string | null | undefined' is not assignable to type 'string'. L90:14: Type 'string | null | undefined' is not assignable to type 'string'. L91:14: Type 'string | null | undefined' is not assignable to type 'string'. src/lib/components/workflow/parent-workflow-table.svelte (6) L32:10: Type 'string | null | undefined' is not assignable to type 'string'. L33:10: Type 'string | null | undefined' is not assignable to type 'string'. L39:10: Type 'string | null | undefined' is not assignable to type 'string'. L48:10: Type 'string | null | undefined' is not assignable to type 'string'. L49:10: Type 'string | null | undefined' is not assignable to type 'string'. L55:10: Type 'string | null | undefined' is not assignable to type 'string'.

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