refactor(soma): route FieldProvider through field/internals barrel + register DRP view sub-parts (audit Round 3 §3 #23 + P4 follow-up)

Two related housekeeping items in one commit:

**1. FieldProvider via barrel (audit Round 3 §3 #23)**

37 consumer files across soma imported `FieldProvider` from the deep
path `'../field/field-provider.svelte'`, mirroring the same pattern
that motivated `internals.ts` indirection on the 5 pickers earlier.
Adds `src/uix/soma/components/field/internals.ts` re-exporting
`FieldProvider` and exposes it from the barrel `exports.ts`. The 37
imports become the canonical `from '../field'`. Consistency only —
no behavioral change.

**2. DateRangePicker view sub-parts (P4 follow-up)**

The MonthView/YearView soma parts created in commit `e93c0c73` stamp
internal layout data-attrs (`-header`, `-prev`, `-heading`, `-next`,
`-grid`, `-cell`) that weren't declared in the morfo, surfacing as 12
hardcoded-data-attr violations once the contract suite caught up.

Declares the 12 sub-parts in the morfo with the canonical kebab
prefix (`month-view-*`, `year-view-*`). Each entry minimal (data: [],
aria: []) except `*-prev` / `*-next` which stamp `type='button'` and
`*-cell` which surfaces the `data-range-{start,end,in-range}`
classification states used by the eidos range tinting CSS.

Test result: 2393/2399 passing — back to the canonical 6 fails
(Words + cookie infra). The 13 transient regressions are closed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/uix/morfo/components/date-range-picker.ts

@@ -258,6 +258,75 @@ export const dateRangePickerMorfo = {
 				}
 			]
 		},
+		// MonthView internal layout slots — stamped by soma, targeted
+		// by eidos CSS. Flat in the morfo per `month-view-*` namespacing.
+		{
+			name: 'MonthViewHeader',
+			kebab: 'month-view-header',
+			archetype: 'header',
+			kind: 'public',
+			defaultElement: 'div',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'MonthViewPrev',
+			kebab: 'month-view-prev',
+			archetype: 'trigger',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [],
+			aria: [{ attr: 'type', value: v.literal('button') }]
+		},
+		{
+			name: 'MonthViewHeading',
+			kebab: 'month-view-heading',
+			archetype: 'label',
+			kind: 'public',
+			defaultElement: 'span',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'MonthViewNext',
+			kebab: 'month-view-next',
+			archetype: 'trigger',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [],
+			aria: [{ attr: 'type', value: v.literal('button') }]
+		},
+		{
+			name: 'MonthViewGrid',
+			kebab: 'month-view-grid',
+			archetype: 'group',
+			kind: 'public',
+			defaultElement: 'div',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'MonthViewCell',
+			kebab: 'month-view-cell',
+			archetype: 'item',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [
+				{ attr: 'data-range-start', severity: 'optional' },
+				{ attr: 'data-range-end', severity: 'optional' },
+				{ attr: 'data-in-range', severity: 'optional' }
+			],
+			aria: [{ attr: 'type', value: v.literal('button') }]
+		},
 		{
 			// Year-view range bridge for `kind='year'`. Symmetric to the
 			// MonthView but with decade pagination.
@@ -276,6 +345,75 @@ export const dateRangePickerMorfo = {
 					severity: 'optional'
 				}
 			]
+		},
+		// YearView internal layout slots — same shape as MonthView's, with
+		// decade navigation labels.
+		{
+			name: 'YearViewHeader',
+			kebab: 'year-view-header',
+			archetype: 'header',
+			kind: 'public',
+			defaultElement: 'div',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'YearViewPrev',
+			kebab: 'year-view-prev',
+			archetype: 'trigger',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [],
+			aria: [{ attr: 'type', value: v.literal('button') }]
+		},
+		{
+			name: 'YearViewHeading',
+			kebab: 'year-view-heading',
+			archetype: 'label',
+			kind: 'public',
+			defaultElement: 'span',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'YearViewNext',
+			kebab: 'year-view-next',
+			archetype: 'trigger',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [],
+			aria: [{ attr: 'type', value: v.literal('button') }]
+		},
+		{
+			name: 'YearViewGrid',
+			kebab: 'year-view-grid',
+			archetype: 'group',
+			kind: 'public',
+			defaultElement: 'div',
+			optional: true,
+			data: [],
+			aria: []
+		},
+		{
+			name: 'YearViewCell',
+			kebab: 'year-view-cell',
+			archetype: 'item',
+			kind: 'public',
+			defaultElement: 'button',
+			role: 'button',
+			optional: true,
+			data: [
+				{ attr: 'data-range-start', severity: 'optional' },
+				{ attr: 'data-range-end', severity: 'optional' },
+				{ attr: 'data-in-range', severity: 'optional' }
+			],
+			aria: [{ attr: 'type', value: v.literal('button') }]
 		}
 		// Footer / Clear / Cancel / Close — chrome shared via picker-shell;
 		// not declared here. Eidos `<DateRangePicker.Footer/Clear/Cancel/

src/uix/soma/components/button/button-provider.svelte.ts

@@ -1,5 +1,5 @@
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { buttonMorfo } from '../../../morfo/components/button';
 import type { OptsFromProps } from '../../provider';
 import type { OnChangeFn, SomaMouseEvent } from '../../types';

src/uix/soma/components/color-field/color-field-provider.svelte.test.ts

@@ -15,7 +15,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	ColorFieldFormatSelectProvider,

src/uix/soma/components/color-field/color-field-provider.svelte.ts

@@ -38,7 +38,7 @@ import {
 	moveToNextSegment,
 	moveToPrevSegment
 } from '../../datetime';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { COLOR_FIELD_LANGS } from './langs';
 import type { ColorOnInvalid, ColorValidator } from './types';
 

src/uix/soma/components/color-picker/color-picker-provider.svelte.test.ts

@@ -14,7 +14,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	ColorPickerAreaProvider,

src/uix/soma/components/color-picker/color-picker-provider.svelte.ts

@@ -15,7 +15,7 @@ import {
 	type ColorFormat,
 	type EditableColorSegmentPart
 } from '$libs/color';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import {
 	pickerShellContext,
 	type PickerShellHandle,

src/uix/soma/components/date-field/date-field-provider.svelte.test.ts

@@ -24,7 +24,7 @@ import {
 	initSegmentStates,
 	isAcceptableSegmentKey
 } from '$soma/datetime';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { DateFieldProvider } from './date-field-provider.svelte';
 

src/uix/soma/components/date-field/date-field-provider.svelte.ts

@@ -68,7 +68,7 @@ import {
 	setDescription,
 	type Announcer
 } from '../../datetime';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { DATE_FIELD_LANGS } from './langs';
 
 // ── Contract ─────────────────────────────────────────────────────────────────

src/uix/soma/components/date-range-field/date-range-field-provider.svelte.test.ts

@@ -18,7 +18,7 @@ import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
 import type { Direction } from '../../types';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	DateRangeFieldLabelProvider,

src/uix/soma/components/date-range-field/date-range-field-provider.svelte.ts

@@ -19,7 +19,7 @@ import {
 	type Granularity,
 	type HourCycle
 } from '$libs/days';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { dateRangeFieldMorfo } from '../../../morfo/components/date-range-field';
 

src/uix/soma/components/field/exports.ts

@@ -1,3 +1,8 @@
+// Provider class (consumed by other form-control providers that
+// integrate with Field's labelId/description/invalid state via
+// `FieldProvider.get()` context lookup).
+export { FieldProvider } from './internals';
+
 export { default as Provider } from './components/field.svelte';
 export { default as Label } from './components/field-label.svelte';
 export { default as RequiredIndicator } from './components/field-required-indicator.svelte';

src/uix/soma/components/field/internals.ts

@@ -0,0 +1,15 @@
+// Indirection layer for the public barrel.
+//
+// Soma's `exports.ts` cannot import directly from `*provider.svelte.ts`
+// (contract: "public barrel must not re-export provider implementation
+// filenames"). This file is the canonical re-export point — consumers
+// reach it through `$soma/components/field` via `exports.ts`.
+//
+// `FieldProvider` is consumed across the soma codebase (37+ sites:
+// every form-control provider that integrates with Field's labelId /
+// description / invalid state). They now import via the barrel:
+//
+//   import { FieldProvider } from '../field';
+//
+// instead of the deep path that bypassed the indirection.
+export { FieldProvider } from './field-provider.svelte';

src/uix/soma/components/file-upload/file-upload-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	FileUploadClearTriggerProvider,

src/uix/soma/components/file-upload/file-upload-provider.svelte.ts

@@ -5,7 +5,7 @@ import type { OnChangeFn, SomaMouseEvent } from '../../types';
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
 import { FILE_UPLOAD_LANGS } from './langs';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import type { FileRejection, FileRejectionReason } from './types';
 import { formatBytes } from './format';
 

src/uix/soma/components/grid-list/grid-list-provider.svelte.ts

@@ -6,7 +6,7 @@ import type { OnChangeFn, Direction, SomaKeyboardEvent, SomaMouseEvent } from '.
 import { KEYS, getDirectionalKeys } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
 import { TypeaheadBuffer } from '../../typeahead';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { GRID_LIST_LANGS } from './langs';
 import type { GridListSelectionMode } from './types';
 

src/uix/soma/components/listbox/listbox-provider.svelte.test.ts

@@ -7,7 +7,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	ListboxGroupLabelProvider,

src/uix/soma/components/listbox/listbox-provider.svelte.ts

@@ -12,7 +12,7 @@ import type {
 import { KEYS, getDirectionalKeys } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
 import { TypeaheadBuffer } from '../../typeahead';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { LISTBOX_LANGS } from './langs';
 import type { ListboxSelectionMode } from './types';
 

src/uix/soma/components/number-field/number-field-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	NumberFieldDecrementTriggerProvider,

src/uix/soma/components/number-field/number-field-provider.svelte.ts

@@ -12,7 +12,7 @@ import type {
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
 import { NUMBER_FIELD_LANGS } from './langs';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 // ── Intl fallback cache ──────────────────────────────────────────────────────
 // Used when `Soma` (or `soma.nums`) is not configured. Keeps `NumberField`

src/uix/soma/components/password-field/password-field-provider.svelte.ts

@@ -15,7 +15,7 @@ import type {
 } from '../../types';
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { PASSWORD_FIELD_LANGS } from './langs';
 
 import { passwordFieldMorfo } from '../../../morfo/components/password-field';

src/uix/soma/components/pin-input/pin-input-provider.svelte.ts

@@ -15,7 +15,7 @@ import type {
 	SomaEvent
 } from '../../types';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { PIN_INPUT_LANGS } from './langs';
 import type { PinInputCellData, PinInputType } from './types';
 

src/uix/soma/components/radio-group/radio-group-provider.svelte.test.ts

@@ -15,7 +15,7 @@ import {
 	RadioGroupProvider,
 	RadioItemProvider
 } from './radio-group-provider.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 function withEffectRoot<T>(fn: () => T): { result: T; cleanup: () => void } {
 	let result!: T;

src/uix/soma/components/radio-group/radio-group-provider.svelte.ts

@@ -6,7 +6,7 @@ import type { Orientation, Direction, SomaMouseEvent, SomaKeyboardEvent } from '
 import { getDirectionalKeys } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
 import type { SomaRuntime, SomaRuntimePart } from '../../runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { radioGroupMorfo } from '../../../morfo/components/radio-group';
 

src/uix/soma/components/rating-group/rating-group-provider.svelte.ts

@@ -10,7 +10,7 @@ import type {
 } from '../../types';
 import { KEYS, getDirectionalKeys } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { RATING_GROUP_LANGS } from './langs';
 import type { RatingItemDescriptor, RatingItemState } from './types';
 

src/uix/soma/components/search-field/search-field-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	SearchFieldClearTriggerProvider,

src/uix/soma/components/search-field/search-field-provider.svelte.ts

@@ -16,7 +16,7 @@ import type {
 } from '../../types';
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { SEARCH_FIELD_LANGS } from './langs';
 
 import { searchFieldMorfo } from '../../../morfo/components/search-field';

src/uix/soma/components/slider/slider-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	SliderProvider,

src/uix/soma/components/slider/slider-provider.svelte.ts

@@ -6,7 +6,7 @@ import { KEYS, getDirectionalKeys } from '../../keyboard';
 
 import { sliderMorfo } from '../../../morfo/components/slider';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import type { SomaRuntime, SomaRuntimePart } from '../../runtime.svelte';
 import { resolveSliderDragSound, type SemaSignatureOverride } from '$uix/sema';
 import type { SliderType } from './types';

src/uix/soma/components/switch/switch-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { SwitchProvider, SwitchThumbProvider } from './switch-provider.svelte';
 

src/uix/soma/components/switch/switch-provider.svelte.ts

@@ -4,7 +4,7 @@ import type { OptsFromProps } from '../../provider';
 import type { OnChangeFn, SomaMouseEvent } from '../../types';
 import { Soma } from '../../core/soma.svelte';
 import type { SomaRuntime, SomaRuntimePart } from '../../runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { switchMorfo } from '../../../morfo/components/switch';
 import type { SwitchProps } from './types';

src/uix/soma/components/textarea/textarea-provider.svelte.ts

@@ -15,7 +15,7 @@ import type {
 } from '../../types';
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { TEXTAREA_LANGS } from './langs';
 
 import { textareaMorfo } from '../../../morfo/components/textarea';

src/uix/soma/components/time-field/time-field-provider.svelte.test.ts

@@ -16,7 +16,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { TimeFieldProvider } from './time-field-provider.svelte';
 

src/uix/soma/components/time-field/time-field-provider.svelte.ts

@@ -53,7 +53,7 @@ import {
 	setDescription,
 	type Announcer
 } from '../../datetime';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { TIME_FIELD_LANGS } from './langs';
 
 // ── Contract ─────────────────────────────────────────────────────────────────

src/uix/soma/components/time-range-field/time-range-field-provider.svelte.test.ts

@@ -18,7 +18,7 @@ import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
 import type { Direction } from '../../types';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import {
 	TimeRangeFieldLabelProvider,

src/uix/soma/components/time-range-field/time-range-field-provider.svelte.ts

@@ -14,7 +14,7 @@ import {
 	type TimeGranularity,
 	type HourCycle
 } from '$libs/days';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { timeRangeFieldMorfo } from '../../../morfo/components/time-range-field';
 

src/uix/soma/components/toggle/toggle-provider.svelte.test.ts

@@ -8,7 +8,7 @@ import { state } from '$libs/reactive';
 import type { Morfo } from '$uix/morfo';
 import { Soma } from '$soma/core/soma.svelte';
 import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 
 import { ToggleProvider } from './toggle-provider.svelte';
 

src/uix/soma/components/toggle/toggle-provider.svelte.ts

@@ -1,5 +1,5 @@
 import { Soma } from '../../core/soma.svelte';
-import { FieldProvider } from '../field/field-provider.svelte';
+import { FieldProvider } from '../field';
 import { toggleMorfo } from '../../../morfo/components/toggle';
 import type { OptsFromProps } from '../../provider';
 import type { OnChangeFn, SomaMouseEvent } from '../../types';