feat: support custom FieldInput and document date presets

[ladparth]

Description

This PR addresses two issues:

1. Aligns the public render and field helper APIs to accept FieldInput / CustomFieldInput instead of the built-in Field union type to support custom fields end-to-end (Closes Custom FieldInput support is not reflected across render and field helper APIs #160).
2. Documents the calendar ui.presets property in the date field docs (Closes [FEAT] Document using of the ui.presets property #157).

Key Changes

Core (form-core)

• Widened container field schema definitions (GroupField, ArrayField, RowField, CollapsibleField, and Tab) to accept FieldInput[] instead of Field[].
• Updated traversal (walkFields), defaults (extractDefaults), visibility (getVisibleFields), dependency extraction (extractDependencies, extractDependenciesFromFields), and validation APIs (validateFields, validatePath, validateField, findFieldByPath, deriveFieldChecks) to accept FieldInput.
• Widened the parameters of isDataField and isLayoutField type guards.
• Removed unused Field import in validation/index.ts.
• Added a new comprehensive test suite custom-field-input.test.ts with 22 new tests covering flat and nested custom field configurations across all core helpers.

React Adapter (form-react)

• Widened FieldRendererProps.field to FieldInput and RenderFieldsProps.fields to readonly FieldInput[].
• Updated FieldRegistry to support dynamic indexing of arbitrary custom field types ([customType: string]: ComponentType | undefined).
• Widened error collection and count hooks (collectDataFieldNames and useNestedErrorCount) to handle custom FieldInput fields.

Docs / Web (apps/web)

• Documented using the ui.presets property and added configuration examples inside apps/web/content/docs/fields/data/date.mdx.
• Widened the local fields prop inside apps/web/registry/shadcn/fields/tabs.tsx to FieldInput[].
• Regenerated the shadcn built registry files (apps/web/public/r/tabs.json).

Other

• Manually created release changesets for @buildnbuzz/form-core and @buildnbuzz/form-react.

Type of change

• feat (New feature)
• docs (Documentation changes)
• test (Adding or updating tests)

Related Issues

• Closes [FEAT] Document using of the ui.presets property #157
• Closes Custom FieldInput support is not reflected across render and field helper APIs #160

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Project	Deployment	Actions	Updated (UTC)
buzzform	Ready	Preview, Comment	Jun 9, 2026 6:51pm