@@ -0,0 +1,35 @@
+---
+'@object-ui/components': patch
+'@object-ui/plugin-grid': patch
+'@object-ui/plugin-list': patch
+'@object-ui/i18n': patch
+'@object-ui/app-shell': patch
+---
+
+feat(ui)!: a record opened from a list opens in the drawer by default, and the split pane beside the list retires
+
+Clause-②: yes (narrowing)
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (runtime-export-retired @object-ui/components#RECORD_SPLIT_MIN_CONTENT_PX, @object-ui/components#RecordListFaceProvider, @object-ui/components#useRecordListFace, @object-ui/components#recordListFaceFor, @object-ui/components#RECORD_LIST_CARD_FACE_BELOW_PX, @object-ui/components#RECORD_LIST_NARROW_COLUMN_COUNT, @object-ui/components#RecordListFace) the retired operands are a React context provider, a hook, a helper, two constants and a type of the split pane's narrowed list face, in a published ui package's entry; no packages/spec schema, no registered node type, no ADR-0087 conversion surface and no stored shape names them (the split mode already left `NavigationModeSchema`), so there is nothing for `objectstack migrate meta` to rewrite -->
+
+**BREAKING** for a host that drew the split pane through `@object-ui/components`, read its narrowed list face, or passed the Display menu a `split` choice. The maintainer ruled 「默认改抽屉，分屏彻底退役，只留抽屉和整页」: a record opens in the drawer or as the full page, and the split pane is gone.
+
+- **The Console.** A row click on a drawer-mode object opens the record in the non-modal drawer over the list, which keeps its full width and every view column. A click on another row swaps the record, ↑ ↓ step through the list, the drawer drags from 360 px to 60% of the window, and ⤢ maximizes it in place. A view that declares `navigation.mode: 'page'` and a phone still open the full page. No metadata changes: `navigation.mode` keeps its values.
+- **The reader's preference.** The Display menu's 「打开记录」 (Open records) offers Drawer and Full page only. The preference under `os:record-open-mode` is `drawer` or `page`; a stored `split` is an unknown value and reads as the default, the drawer, with no compatibility read.
+- **`@object-ui/components`.** `NavigationOverlay` draws the drawer for `mode: 'drawer'` and no longer has a `split` face: `NavigationOverlayMode` is `page | drawer | new_window | none`. Over a `mainContent` list the drawer is non-modal and undimmed, as before, and the list keeps its full width. The open-row store stays (`ActiveListRecordProvider`, `useIsActiveListRecord`, `ActiveListRow`, `useScrollActiveListRecordIntoView`, `listRecordIdOf`). The split pane's 「Close panel」 label is no longer drawn; the drawer's ✕ is 「Close」.
+- **`@object-ui/plugin-grid`.** The grid no longer narrows to three columns or to compact card rows beside a record pane; it draws every view column.
+- **`@object-ui/plugin-list`.** `ListView`'s record-count bar always prints its count. The `recordOpen` host prop offers two choices: its `preference` is `'drawer' | 'page'`, its `setPreference` takes either, and its `selectPage` member is gone (pass `setPreference('page')`).
+- **`@object-ui/i18n`.** `list.recordOpenSplit` leaves all ten packs.
+
+What leaves, and what to write instead:
+
+- FROM `RECORD_SPLIT_MIN_CONTENT_PX` TO nothing: the drawer has no width floor to fall back from.
+- FROM `RecordListFaceProvider` TO nothing: no list is narrowed any more, so there is no face to publish.
+- FROM `useRecordListFace` TO nothing: a list under the drawer draws its full face; read `useIsActiveListRecord` for the open row.
+- FROM `recordListFaceFor` TO nothing.
+- FROM `RECORD_LIST_CARD_FACE_BELOW_PX` TO nothing.
+- FROM `RECORD_LIST_NARROW_COLUMN_COUNT` TO nothing.
+- FROM `RecordListFace` TO nothing.
+
+A host that passed `mode="split"` to `NavigationOverlay` passes `mode="drawer"` with the same `mainContent`. A host of the Display menu that passed `selectPage` drops it and lets `setPreference` receive `'page'`.
@@ -503,24 +503,22 @@ record as a full page in a new browser tab. Inert rows stay inert: `mode: 'none'
 `preventNavigation`, and `operations.read: false` without a `navigation` config
 ignore a modifier click too.
 
-#### The Console's record pane
+#### The Console's record drawer
 
-In the Console's object pages, a record that opens in the drawer opens
-**beside the list** by default. The pane is 720 px wide, and the reader can
-drag its divider from 360 px to 60% of the viewport. The list next to it stays
-readable and clickable:
+In the Console's object pages, a record that opens in the drawer opens in a
+drawer **over the list**, and the list keeps its full width. The drawer is
+720 px wide, and the reader can drag its edge from 360 px to 60% of the
+viewport. It draws no dimming overlay and is non-modal, so the list behind it
+stays readable and clickable:
 
-- it shows its first three non-avatar columns, or one card row per record when
-  it is narrower than 440 px;
-- the open record's row is highlighted and follows the pane's ↑ ↓;
+- the open record's row is highlighted and follows the drawer's ↑ ↓;
 - clicking another row swaps the record.
 
-On a content area narrower than 1000 px, the pane becomes the drawer over the
-list. The drawer is non-modal too. Readers who prefer the drawer, or the full
-page, choose it in the list's Display menu (Open records). That choice is the
-reader's own, stored in the browser, never metadata.
+Readers who prefer the full page choose it in the list's Display menu (Open
+records: Drawer or Full page). That choice is the reader's own, stored in the
+browser, never metadata.
 
-The pane's ⤢ maximizes it in place, up to the sidebar. The URL and history
+The drawer's ⤢ maximizes it in place, up to the sidebar. The URL and history
 stay as they are, and ⤡ or `Esc` restores it. The full page opens from a row's
 ↗, or from 「Open as full page」, the last host item of the record header's
 `⋯`. 「Collapse to drawer」 on that page returns to the list only when the ↗
 
@@ -525,13 +525,13 @@ from. `modal`, `split` and `popover` were removed in @objectstack/spec 18.3.0 (A
 a stored value is refused with its fix, and `os migrate meta --from 17` drops it. On a phone
 every record opens as a page, whatever the view declares.
 
-Whether the record opens beside the list is the reader's choice, not the view's. The list's
-**Display** menu offers **Open records**: **Split** (the default) draws the record page in a
-pane beside the list, **Drawer** draws it over the list, and **Full page** navigates. The
-choice is kept in the browser for every drawer-mode object, and is not offered for an object
-declared to open as a page; a record's **↗** always opens the full page. The reader also
-drags the pane's edge, and **⤢** or **Open as full page** leaves the pane, while **Collapse
-to drawer** returns to the stack it left. The `size` bucket on `navigation` sets only the
+Whether a row opens the drawer or the full page is the reader's choice, not the view's. The
+list's **Display** menu offers **Open records**: **Drawer** (the default) draws the record over
+the list, which keeps its full width, and **Full page** navigates. The choice is kept in the
+browser for every drawer-mode object, and is not offered for an object declared to open as a
+page; a record's **↗** always opens the full page. The reader also drags the drawer's edge,
+**⤢** maximizes it in place, **Open as full page** leaves the drawer, and **Collapse to
+drawer** returns to the stack it left. The `size` bucket on `navigation` sets only the
 drawer's starting width; `width` is deprecated.
 
 The record opened from a list is addressable: `?recordId=` on the list's URL, so a
 
@@ -9,12 +9,12 @@
 /**
  * objectstack#26677 — the reader's record-open preference, read side.
  *
- * `split` left `NavigationModeSchema`: the side-by-side pane is a reader's own
- * choice, kept per browser under `os:record-open-mode`. These rows pin what
- * the console reads: the values it knows, and the default for everything
- * else — no value, an unknown one, no storage, a storage that throws.
- * objectstack#27545: the default is the split pane, and `page` (the Display
- * menu's 「Full page」) is a value it knows.
+ * How a drawer-mode record opens is a reader's own choice, kept per browser
+ * under `os:record-open-mode`. These rows pin what the console reads: the
+ * values it knows, and the default for everything else — no value, an
+ * unknown one, no storage, a storage that throws. objectstack#28915: the
+ * drawer is the default, the split pane retired, and a stored `split` is an
+ * unknown value like any other (no compatibility read).
  */
 
 import { describe, it, expect } from 'vitest';
@@ -30,32 +30,32 @@ const storageWith = (value: string | null) => ({ getItem: (key: string) => (key
 describe('readRecordOpenPreference (objectstack#26677)', () => {
   it('the key and the default are the ones the Display-menu control will write against', () => {
     expect(RECORD_OPEN_PREFERENCE_KEY).toBe('os:record-open-mode');
-    expect(DEFAULT_RECORD_OPEN_PREFERENCE).toBe('split');
+    expect(DEFAULT_RECORD_OPEN_PREFERENCE).toBe('drawer');
   });
 
-  it('reads the three values it knows', () => {
-    expect(readRecordOpenPreference(storageWith('split'))).toBe('split');
+  it('reads the two values it knows', () => {
     expect(readRecordOpenPreference(storageWith('drawer'))).toBe('drawer');
     expect(readRecordOpenPreference(storageWith('page'))).toBe('page');
   });
 
-  it('answers the split pane for no value, an unknown value, or a retired mode name', () => {
-    expect(readRecordOpenPreference(storageWith(null))).toBe('split');
-    expect(readRecordOpenPreference(storageWith('modal'))).toBe('split');
-    expect(readRecordOpenPreference(storageWith('SPLIT'))).toBe('split');
+  it('answers the drawer for no value, an unknown value, or a retired mode name — a stored `split` included', () => {
+    expect(readRecordOpenPreference(storageWith(null))).toBe('drawer');
+    expect(readRecordOpenPreference(storageWith('split'))).toBe('drawer');
+    expect(readRecordOpenPreference(storageWith('modal'))).toBe('drawer');
+    expect(readRecordOpenPreference(storageWith('PAGE'))).toBe('drawer');
   });
 
-  it('answers the split pane with no storage, and with a storage that throws', () => {
-    expect(readRecordOpenPreference(null)).toBe('split');
+  it('answers the drawer with no storage, and with a storage that throws', () => {
+    expect(readRecordOpenPreference(null)).toBe('drawer');
     const throwing = { getItem: () => { throw new Error('SecurityError'); } };
-    expect(readRecordOpenPreference(throwing)).toBe('split');
+    expect(readRecordOpenPreference(throwing)).toBe('drawer');
   });
 
-  it('with no `window` at all (SSR — this file runs in the node project), the default storage is absent: the split pane', () => {
+  it('with no `window` at all (SSR — this file runs in the node project), the default storage is absent: the drawer', () => {
     // The browser's own `localStorage` is read by the console's object page;
     // `ObjectView.recordOpenPreference-26677.test.tsx` drives that path.
     expect(typeof window).toBe('undefined');
-    expect(readRecordOpenPreference()).toBe('split');
+    expect(readRecordOpenPreference()).toBe('drawer');
   });
 });
 
@@ -71,18 +71,17 @@ describe('writeRecordOpenPreference (objectstack#26681)', () => {
 
   it('keeps the choice under the key the read side reads', () => {
     const storage = memoryStorage();
-    writeRecordOpenPreference('split', storage);
-    expect(storage.getItem(RECORD_OPEN_PREFERENCE_KEY)).toBe('split');
-    expect(readRecordOpenPreference(storage)).toBe('split');
-    writeRecordOpenPreference('drawer', storage);
-    expect(readRecordOpenPreference(storage)).toBe('drawer');
     writeRecordOpenPreference('page', storage);
+    expect(storage.getItem(RECORD_OPEN_PREFERENCE_KEY)).toBe('page');
     expect(readRecordOpenPreference(storage)).toBe('page');
+    writeRecordOpenPreference('drawer', storage);
+    expect(storage.getItem(RECORD_OPEN_PREFERENCE_KEY)).toBe('drawer');
+    expect(readRecordOpenPreference(storage)).toBe('drawer');
   });
 
   it('writes nothing and throws nothing with no storage, or with a storage that refuses the write', () => {
-    expect(() => writeRecordOpenPreference('split', null)).not.toThrow();
+    expect(() => writeRecordOpenPreference('page', null)).not.toThrow();
     const refusing = { setItem: () => { throw new Error('QuotaExceededError'); } };
-    expect(() => writeRecordOpenPreference('split', refusing)).not.toThrow();
+    expect(() => writeRecordOpenPreference('page', refusing)).not.toThrow();
   });
 });
@@ -19,17 +19,17 @@ import {
  * object opens its records in the drawer — a READER's own preference, not
  * metadata (objectstack#26677).
  *
- * The maintainer's record-page model (ruling 2026-10-27): an object opens its
- * records one way — the drawer, which expands to the full page, by default,
- * or the full page where the object declares `navigation.mode: 'page'` — and
- * the side-by-side pane is each reader's own choice. So `split` left
- * `NavigationModeSchema` (an author can no longer fix it for every reader) and
- * lives here instead: `split` draws the record page beside the list, `drawer`
- * draws it in the drawer over the list, `page` opens the full page.
+ * The maintainer's record-page model: an object opens its records one way —
+ * the drawer, which expands to the full page, by default, or the full page
+ * where the object declares `navigation.mode: 'page'`. A reader of a drawer
+ * object chooses between two: `drawer` draws the record in the drawer over
+ * the list, which keeps its full width, and `page` opens the full page.
  *
- * Since objectstack#27545 (maintainer rulings of 2026-10-29) the pane beside
- * the list is the default, and `page` is the third choice, for a reader who
- * wants a row click to open the record page itself.
+ * The drawer is the default (objectstack#28915, maintainer ruling
+ * 2026-11-02: 「默认改抽屉，分屏彻底退役，只留抽屉和整页」). The pane beside
+ * the list that objectstack#27545 made the default is retired: a stored
+ * `split` is an unknown value like any other and reads as the default, with
+ * no compatibility read.
  *
  * Both sides live here: {@link readRecordOpenPreference} and
  * {@link writeRecordOpenPreference}, and {@link useRecordOpenPreference}, the
@@ -48,17 +48,17 @@ import {
  * A thin alias over the console's one preference store,
  * `workspacePreference.ts` (objectstack#27052): the preference is
  * {@link RECORD_OPEN_PREFERENCE} there, in the `user` scope, and it keeps the
- * spelling it was first stored with — a bare `split` / `drawer` / `page` under
+ * spelling it was first stored with — a bare `drawer` / `page` under
  * {@link RECORD_OPEN_PREFERENCE_KEY} — so a reader's earlier choice reads
  * back unchanged.
  */
-export type RecordOpenPreference = 'split' | 'drawer' | 'page';
+export type RecordOpenPreference = 'drawer' | 'page';
 
 /** The `localStorage` key the preference is kept under. */
 export const RECORD_OPEN_PREFERENCE_KEY = 'os:record-open-mode';
 
-/** What a reader who never chose gets: the pane beside the list. */
-export const DEFAULT_RECORD_OPEN_PREFERENCE: RecordOpenPreference = 'split';
+/** What a reader who never chose gets: the drawer over the list. */
+export const DEFAULT_RECORD_OPEN_PREFERENCE: RecordOpenPreference = 'drawer';
 
 /** The storage surface this module reads — `localStorage`, or a test double. */
 export type RecordOpenPreferenceStorage = Pick<Storage, 'getItem'>;
@@ -75,16 +75,16 @@ export const RECORD_OPEN_PREFERENCE = defineWorkspacePreference<RecordOpenPrefer
   name: 'record.open-mode',
   storageKey: () => RECORD_OPEN_PREFERENCE_KEY,
   codec: {
-    decode: (stored) => (stored === 'split' || stored === 'drawer' || stored === 'page' ? stored : undefined),
+    decode: (stored) => (stored === 'drawer' || stored === 'page' ? stored : undefined),
     encode: (value) => value,
   },
 });
 
 /**
  * The reader's record-open preference, or {@link DEFAULT_RECORD_OPEN_PREFERENCE}
- * when none is stored, the stored value is not one of the three, or there is no
- * readable storage. `storage` defaults to the browser's `localStorage`; `null`
- * says there is none.
+ * when none is stored, the stored value is not one of the two (a retired
+ * `split` included), or there is no readable storage. `storage` defaults to
+ * the browser's `localStorage`; `null` says there is none.
  */
 export function readRecordOpenPreference(
   storage: RecordOpenPreferenceStorage | null = workspacePreferenceStorage(),
@@ -114,7 +114,7 @@ export function writeRecordOpenPreference(
  * The reader's record-open preference as live state, and the setter the
  * Display menu writes it with (objectstack#26681). A write here, in another
  * component of this page, or in another tab re-renders every caller, so the
- * object page decides its split face from the value the reader just chose.
+ * object page opens the next record the way the reader just chose.
  */
 export function useRecordOpenPreference(): [RecordOpenPreference, (next: RecordOpenPreference) => void] {
   return useWorkspacePreference(RECORD_OPEN_PREFERENCE, 'user', DEFAULT_RECORD_OPEN_PREFERENCE);
 
@@ -215,8 +215,8 @@ describe('objectstack#27950 — the list title names the object ahead of the vie
     expect(crumb()).toHaveTextContent(/^Leads$/);
   });
 
-  it('a record open beside the list (the split pane) leaves one object label and one switcher', async () => {
-    localStorage.setItem(RECORD_OPEN_PREFERENCE_KEY, 'split');
+  it('a record open in the drawer over the list leaves one object label and one switcher', async () => {
+    localStorage.removeItem(RECORD_OPEN_PREFERENCE_KEY);
     mount('/apps/crm/crm_lead/view/mine?recordId=lead_1');
     await listToolbar();
     expect(screen.getAllByTestId('object-list-crumb')).toHaveLength(1);
 
@@ -15,9 +15,10 @@
  *    way;
  *  - a `?recordId=` link (a shared pane URL) is replaced by the record page,
  *    so Back does not return to a URL that reopens it;
- *  - a reader's split or drawer preference draws nothing on a phone, and the
+ *  - a reader's drawer or page preference draws nothing on a phone, and the
  *    Display menu has no Open records section to set one;
- *  - control: at 1440 px the same `?recordId=` opens the pane beside the list.
+ *  - control: at 1440 px the same `?recordId=` opens the drawer over the list
+ *    (the split pane beside it retired, objectstack#28915).
  *
  * The record body is not what this file reads, so `RecordDetailView` is a
  * null sink.
@@ -215,7 +216,7 @@ describe('on a phone a record opens as a page, always (objectstack#27058)', () =
     expect(screen.queryByRole('dialog')).toBeNull();
   });
 
-  it.each([['split'], ['drawer']])('a reader who prefers %s: nothing is drawn beside the list, and the Display menu offers no Open records', async (preference) => {
+  it.each([['drawer'], ['page']])('a reader who prefers %s: nothing is drawn beside the list, and the Display menu offers no Open records', async (preference) => {
     window.localStorage.setItem(RECORD_OPEN_PREFERENCE_KEY, preference);
     setWidth(PHONE_WIDTH);
     mountList();
@@ -232,10 +233,11 @@ describe('on a phone a record opens as a page, always (objectstack#27058)', () =
     expect(window.localStorage.getItem(RECORD_OPEN_PREFERENCE_KEY)).toBe(preference);
   });
 
-  it('control: at 1440 px the same ?recordId= opens the pane beside the list', async () => {
+  it('control: at 1440 px the same ?recordId= opens the drawer over the list', async () => {
     setWidth(DESKTOP_WIDTH);
     mountList('?recordId=r2');
-    await screen.findByTestId('record-split-pane', undefined, { timeout: 5000 });
+    await screen.findByRole('dialog', undefined, { timeout: 5000 });
+    expect(screen.getByTestId('record-list-host')).toBeTruthy();
     expect(location()).toBe(`${LIST_PATH}?recordId=r2`);
     expect(screen.queryByTestId('record-page-route')).toBeNull();
   });