Associate Combobox hints with form fields

[rossnelson]

Summary

Adds first-class hint text support to Combobox and associates hints and errors with the field using aria-describedby. Migrates the Cloud Run region hint to the new API.

Test plan

• Unit tests — 2,251 passed, 1 skipped
• Svelte check — 0 errors
• Combobox Storybook tests — 12 passed
• Formatting, ESLint, and Stylelint

[vercel]

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Jul 13, 2026 8:29pm

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 11 errors in 2 files (1.2% of 895 total) src/lib/holocene/combobox/combobox.svelte (10) L155:4: Type 'null' is not assignable to type 'string'. L158:4: 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" | ... 145 more ... | "xmark-square"'. L160:4: Type 'null' is not assignable to type 'keyof T'. L246:4: 'inputElement' is possibly 'null'. L247:4: 'inputElement' is possibly 'null'. L253:14: Argument of type 'string | T | undefined' is not assignable to parameter of type 'string | T'. L258:14: Argument of type 'string | T | undefined' is not assignable to parameter of type 'string | T'. L304:60: Function lacks ending return statement and return type does not include 'undefined'. L397:10: Type 'HTMLLIElement | null' is not assignable to type 'HTMLLIElement'. L397:43: 'menuElement' is possibly 'null'. src/lib/holocene/combobox/combobox.stories.svelte (1) L317:6: Element implicitly has an 'any' type because expression of type '"action"' can't be used to index type '{}'.

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