@@ -0,0 +1,13 @@
+---
+'@object-ui/app-shell': patch
+'@object-ui/i18n': patch
+---
+
+feat(app-shell): the Studio landing gives a base's `.custom` pair no card of its own, and the pending-changes sheet says where a customization is saved
+
+Clause-②: yes (widening)
+Metadata-protocol: none
+
+ADR-0146 D3 folds a base's `<base>.custom` pair under its base. The Studio landing now does the same: a pair whose base is listed draws no card under "My packages" (or with the read-only packages). The base's card keeps its "n customized" line, and that line still links into the pair. A pair whose base is not listed keeps its card. The pair's Export and Delete stay on Studio's Overview → Packages page, which lists every package.
+
+When Studio reviews a read-only base's pair, the pending-changes sheet now says, under its title, "Saved to BASE's customizations" (zh: 保存到 BASE 的定制). `@object-ui/i18n` adds one key, `preview.changes.savedToCustomization`, in all ten locale packs. `DraftChangesPanel` takes an optional `customizationOf` prop, the base's label, and exports `savedToCustomizationText` so other surfaces can say the same sentence. Nothing is removed or narrowed.
@@ -1328,10 +1328,30 @@ export interface DraftChangesPanelProps {
    * nothing to say.
    */
   renderEntryNote?: (entry: DraftChangeEntry) => ReactNode;
+  /**
+   * objectstack ADR-0146 D3 — the label of the read-only base whose
+   * `<base>.custom` pair these drafts are saved to. When set, the sheet says
+   * so under its title ({@link savedToCustomizationText}); the host passes it
+   * only while it reviews a pair's drafts.
+   */
+  customizationOf?: string;
 }
 
 export type DraftChangesPosture = 'review' | 'confirm';
 
+/**
+ * objectstack ADR-0146 D3 — the one sentence that names where a customization
+ * of a read-only base is saved: "Saved to BASE's customizations". The
+ * pending-changes sheet draws it, and the item header reuses it, so both say
+ * the same words.
+ */
+export function savedToCustomizationText(t: Translate, baseLabel: string): string {
+  return t('preview.changes.savedToCustomization', {
+    package: baseLabel,
+    defaultValue: 'Saved to {{package}}’s customizations',
+  });
+}
+
 export function DraftChangesPanel({
   open,
   onOpenChange,
@@ -1341,6 +1361,7 @@ export function DraftChangesPanel({
   publishing = false,
   posture = 'review',
   renderEntryNote,
+  customizationOf,
 }: DraftChangesPanelProps) {
   const { t, language } = useObjectTranslation();
   const [entries, setEntries] = useState<DraftChangeEntry[] | null>(null);
@@ -1608,6 +1629,11 @@ export function DraftChangesPanel({
               defaultValue: 'What publishing will change. New items are added; updates overwrite the live version.',
             })}
           </SheetDescription>
+          {customizationOf ? (
+            <p data-testid="draft-changes-saved-to" className="text-xs font-medium text-foreground">
+              {savedToCustomizationText(t, customizationOf)}
+            </p>
+          ) : null}
         </SheetHeader>
         {posture === 'confirm' && entries && entries.length > 0 && !error ? (
           // objectui#12517 — what the publish carries, counted off the same
 
@@ -11,17 +11,26 @@ import * as React from 'react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { fireEvent, render, screen, waitFor } from '@testing-library/react';
 
-vi.mock('@object-ui/i18n', async (importOriginal) => ({
-  ...(await importOriginal<Record<string, unknown>>()),
-  useObjectTranslation: () => ({
-    t: (_k: string, o?: { defaultValue?: string }) => o?.defaultValue ?? _k,
-  }),
-}));
+// `t()` answers each key's default text; a describe that sets `i18nMode.real`
+// reads the shipped packs through the real hook instead.
+const i18nMode = vi.hoisted(() => ({ real: false }));
+vi.mock('@object-ui/i18n', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('@object-ui/i18n')>();
+  return {
+    ...actual,
+    useObjectTranslation: (ns?: string) =>
+      i18nMode.real
+        ? actual.useObjectTranslation(ns)
+        : { t: (_k: string, o?: { defaultValue?: string }) => o?.defaultValue ?? _k },
+  };
+});
 
+import { createI18n, I18nProvider } from '@object-ui/i18n';
 import { DraftChangesPanel, computeChangeDetail } from '../DraftChangesPanel';
 
 afterEach(() => {
   vi.restoreAllMocks();
+  i18nMode.real = false;
 });
 
 /* ─────────────── computeChangeDetail (pure) ─────────────── */
@@ -249,3 +258,40 @@ describe('DraftChangesPanel — /meta routes are addressed in the singular', ()
     expect(screen.getByRole('heading', { level: 4 }).textContent).toBe('{{count}} objects');
   });
 });
+
+/* ─────────────── where a customization is saved (ADR-0146 D3) ─────────────── */
+
+/**
+ * objectstack#29691 — reviewing a read-only base's `.custom` pair, the sheet
+ * says where the changes are saved, in the one sentence the item header
+ * shares: 保存到 BASE 的定制. Rendered through the real i18next hook and the
+ * shipped packs.
+ */
+describe('DraftChangesPanel — names the base whose customizations it saves (objectstack#29691)', () => {
+  function renderIn(lang: 'en' | 'zh', extra: Partial<React.ComponentProps<typeof DraftChangesPanel>> = {}) {
+    i18nMode.real = true;
+    mockRoutes();
+    const i18n = createI18n({ defaultLanguage: lang, detectBrowserLanguage: false });
+    return render(
+      <I18nProvider instance={i18n} persistLanguage={false}>
+        <DraftChangesPanel open onOpenChange={() => {}} packageId="com.x" {...extra} />
+      </I18nProvider>,
+    );
+  }
+
+  it('says 保存到 HotCRM 的定制 under the title for a pair, in zh', async () => {
+    renderIn('zh', { customizationOf: 'HotCRM' });
+    await waitFor(() => expect(screen.getByTestId('draft-changes-saved-to')).toHaveTextContent(/^保存到 HotCRM 的定制$/));
+  });
+
+  it('says “Saved to HotCRM’s customizations” in en', async () => {
+    renderIn('en', { customizationOf: 'HotCRM' });
+    expect(await screen.findByTestId('draft-changes-saved-to')).toHaveTextContent(/^Saved to HotCRM’s customizations$/);
+  });
+
+  it('CONTROL: a writable package’s own drafts carry no such sentence', async () => {
+    renderIn('en');
+    await waitFor(() => expect(screen.getByText('ticket')).toBeInTheDocument());
+    expect(screen.queryByTestId('draft-changes-saved-to')).not.toBeInTheDocument();
+  });
+});
@@ -185,13 +185,15 @@ describe('Studio landing: a read-only base says "n customized, m switched off" (
     const { requested } = stubWire({ 'com.example.showcase': served('com.example.showcase', 1, 0, 0) });
     renderLanding();
 
-    await screen.findByText('Showcase pair');
+    await screen.findByText('HotCRM customizations');
     await waitFor(() =>
       expect(within(cardOf('Showcase')).getByTestId('studio-landing-customizations')).toHaveAttribute('data-state', 'read'),
     );
     expect(within(cardOf('Acme')).queryByTestId('studio-landing-customizations')).not.toBeInTheDocument();
+    // A pair whose base is not listed keeps its card, with no line.
     expect(within(cardOf('HotCRM customizations')).queryByTestId('studio-landing-customizations')).not.toBeInTheDocument();
-    expect(within(cardOf('Showcase pair')).queryByTestId('studio-landing-customizations')).not.toBeInTheDocument();
+    // A pair whose base is listed has no card at all (#29691's describe below).
+    expect(screen.queryByText('Showcase pair')).not.toBeInTheDocument();
     expect(customizationRequests(requested)).toEqual(['/api/v1/packages/com.example.showcase/customizations']);
   });
 
@@ -210,3 +212,51 @@ describe('Studio landing: a read-only base says "n customized, m switched off" (
     }
   });
 });
+
+/**
+ * objectstack#29691 (ADR-0146 D3) — the landing gives a base's `.custom` pair
+ * no card of its own: the pair is folded under its base, as the package
+ * switcher folds it, and the base's card carries it through its customized
+ * line and link. The pair's export and delete stay on the Packages page.
+ */
+describe('Studio landing: a base’s .custom pair has no card of its own (ADR-0146 D3)', () => {
+  /** Every package card the landing draws, by the id line each card shows. */
+  const cardIds = () =>
+    Array.from(document.querySelectorAll('.rounded-lg.border .font-mono')).map((el) => el.textContent);
+
+  it('draws one card for a base and its writable pair: the base’s, with its customized count and the pair link', async () => {
+    packages.list = [HOTCRM, HOTCRM_PAIR, WRITABLE];
+    stubWire({ hotcrm: served('hotcrm', 2, 1, 0) });
+    renderLanding();
+
+    const line = await within(await waitFor(() => cardOf('HotCRM'))).findByTestId('studio-landing-customizations');
+    await waitFor(() => expect(line).toHaveAttribute('data-state', 'read'));
+    expect(within(line).getByTestId('studio-landing-customizations-pair')).toHaveTextContent(customizedText(3));
+    expect(within(line).getByTestId('studio-landing-customizations-pair')).toHaveAttribute('href', '/studio/hotcrm.custom/data');
+
+    // The pair draws no card, under 我的软件包 or anywhere else.
+    expect(screen.queryByText('HotCRM customizations')).not.toBeInTheDocument();
+    expect(cardIds()).not.toContain('hotcrm.custom');
+    // CONTROL: a writable package that is no pair keeps its card.
+    expect(cardIds()).toEqual(['com.acme.app', 'hotcrm']);
+  });
+
+  it('folds a read-only pair under its listed base too', async () => {
+    packages.list = [SHOWCASE, READONLY_PAIR];
+    stubWire({ 'com.example.showcase': served('com.example.showcase', 1, 0, 0) });
+    renderLanding();
+
+    await waitFor(() => cardOf('Showcase'));
+    expect(screen.queryByText('Showcase pair')).not.toBeInTheDocument();
+    expect(cardIds()).toEqual(['com.example.showcase']);
+  });
+
+  it('keeps the card of a pair whose base is not listed', async () => {
+    packages.list = [HOTCRM_PAIR];
+    stubWire({});
+    renderLanding();
+
+    await waitFor(() => cardOf('HotCRM customizations'));
+    expect(cardIds()).toEqual(['hotcrm.custom']);
+  });
+});
@@ -36,6 +36,7 @@ import { PackageIdInput } from './PackageIdInput.js';
 import { studioOrgScopePath } from './studioScope.js';
 import { STUDIO_ALL_PACKAGES_SEGMENT, studioMetadataAreaPath } from './metadataArea.js';
 import { STUDIO_NEW_PARAM, STUDIO_NEW_PACKAGE_VALUE } from './studioNewPackage.js';
+import { foldCustomizationPairs } from './StudioRailCustomizations.js';
 
 /**
  * objectui#11808 — where a read-only package's card sends the author beyond
@@ -117,8 +118,15 @@ export function BuilderLanding(): React.ReactElement {
           .filter((item): item is RecentNamedItem => item.type === 'package')
           .slice(0, RECENT_PACKAGES_SHOWN);
 
-  const writable = pkgs?.filter((p) => p.writable) ?? [];
-  const readonly = pkgs?.filter((p) => !p.writable) ?? [];
+  // ADR-0146 D3 — a base's `.custom` pair has no card of its own: it is
+  // folded under its base, the way the package switcher folds it
+  // (`foldCustomizationPairs`). The base's card carries the pair through its
+  // customized line and link, and the pair's export and delete stay on the
+  // Packages page, which lists every package. A pair whose base is not listed
+  // keeps its card.
+  const cards = pkgs === null ? [] : foldCustomizationPairs(pkgs).rows;
+  const writable = cards.filter((p) => p.writable);
+  const readonly = cards.filter((p) => !p.writable);
 
   // ADR-0146 D3 — each read-only BASE's card carries "n customized, m switched
   // off", the server's counts (`GET /packages/:id/customizations`), one read
 
@@ -25,7 +25,9 @@
  *  - a walled admin (a group posture, not the platform operator) sees
  *    Customize disabled, and the platform operator does not;
  *  - CONTROL: a base with no pair keeps the read-only Publish and reviews
- *    the base, as before.
+ *    the base, as before;
+ *  - objectstack#29691: reviewing the pair, the panel is handed the base's
+ *    label for its "saved to" sentence, and nothing without a pair.
  */
 
 import '@testing-library/jest-dom/vitest';
@@ -78,8 +80,16 @@ vi.mock('../../components/SuggestedBindingsPanel', () => ({ SuggestedBindingsPan
 vi.mock('../metadata-admin/AccessExplainPanel', () => ({ AccessExplainPanel: () => null }));
 vi.mock('./StudioAiCopilot', () => ({ StudioChatDock: () => null }));
 vi.mock('../../preview/DraftChangesPanel', () => ({
-  DraftChangesPanel: ({ packageId, onPublish }: { packageId: string | null; onPublish?: () => void | Promise<void> }) => (
-    <div data-testid="changes-panel" data-package={packageId ?? ''}>
+  DraftChangesPanel: ({
+    packageId,
+    onPublish,
+    customizationOf,
+  }: {
+    packageId: string | null;
+    onPublish?: () => void | Promise<void>;
+    customizationOf?: string;
+  }) => (
+    <div data-testid="changes-panel" data-package={packageId ?? ''} data-customization-of={customizationOf ?? ''}>
       {onPublish && (
         <button type="button" data-testid="publish-all-drafts" onClick={() => void onPublish()}>
           publish
@@ -233,6 +243,8 @@ function renderWorkbench() {
 
 const publishButton = () => screen.getByRole('button', { name: /^Publish/ });
 const panelPackage = () => screen.getByTestId('changes-panel').getAttribute('data-package');
+/** The base label the host hands the sheet's "saved to" sentence (objectstack#29691); '' when none. */
+const panelCustomizationOf = () => screen.getByTestId('changes-panel').getAttribute('data-customization-of');
 const header = () => screen.getByTestId('if-item-header');
 
 async function openPipeline(): Promise<void> {
@@ -246,6 +258,8 @@ describe('a read-only base with its pair listed: Pending, the panel and Publish
     renderWorkbench();
 
     await waitFor(() => expect(panelPackage()).toBe(PAIR), { timeout: 8000 });
+    // objectstack#29691 — the sheet names the base the pair's drafts are saved for.
+    expect(panelCustomizationOf()).toBe('HotCRM');
     await waitFor(() => expect(srv.reads).toContain(`/api/v1/meta/_drafts?packageId=${encodeURIComponent(PAIR)}`));
     await waitFor(() => expect(publishButton()).toBeEnabled(), { timeout: 8000 });
     expect(publishButton().parentElement).not.toHaveAttribute('data-disabled-reason');
@@ -259,6 +273,7 @@ describe('a read-only base with its pair listed: Pending, the panel and Publish
     await waitFor(() => expect(publishButton().parentElement).toHaveAttribute('data-disabled-reason'), { timeout: 8000 });
     expect(publishButton()).toBeDisabled();
     expect(panelPackage()).toBe(BASE);
+    expect(panelCustomizationOf()).toBe('');
     expect(screen.queryByTestId('publish-all-drafts')).toBeNull();
   });
 });
@@ -278,6 +293,7 @@ describe('end to end: the first edit makes the pair, and Pending and Publish fol
     expect(saved!.body).toStrictEqual({ ...PIPELINE, label: 'Pipeline (ours)', overrides: { package: BASE, basedOn: '4.0.0' } });
 
     await waitFor(() => expect(panelPackage()).toBe(PAIR), { timeout: 8000 });
+    expect(panelCustomizationOf()).toBe('HotCRM');
     await waitFor(() => expect(publishButton()).toBeEnabled(), { timeout: 8000 });
     fireEvent.click(screen.getByTestId('publish-all-drafts'));
     await waitFor(() => expect(srv.publishes).toEqual([PAIR]));
 
@@ -2857,6 +2857,9 @@ function StudioDesignSurfaceBody({ aiSlot, area }: StudioDesignSurfaceProps): Re
           publishing={publishing}
           posture={changesPosture}
           renderEntryNote={renderPublishRefusal}
+          // ADR-0146 D3 — reviewing the pair's drafts, the sheet names the
+          // base they are saved for.
+          customizationOf={pairId !== null ? baseLabel : undefined}
         />
 
         <CreateItemDialog
 
@@ -4887,6 +4887,7 @@ const ar = {
     changes: {
       title: 'التغييرات المعلّقة',
       description: 'ما الذي سيغيّره النشر. تُضاف العناصر الجديدة؛ وتستبدل التحديثات النسخة المنشورة.',
+      savedToCustomization: 'محفوظ في تخصيصات {{package}}',
       loading: 'جارٍ تحميل التغييرات المعلّقة…',
       loadFailed: 'تعذّر تحميل التغييرات المعلّقة:',
       empty: 'لا شيء معلّق — نُشرت كل المسودات.',
 
@@ -4490,6 +4490,7 @@ const de = {
     changes: {
       title: 'Ausstehende Änderungen',
       description: 'Was die Veröffentlichung ändert. Neue Elemente werden hinzugefügt; Aktualisierungen überschreiben die Live-Version.',
+      savedToCustomization: 'Gespeichert in den Anpassungen von {{package}}',
       loading: 'Ausstehende Änderungen werden geladen…',
       loadFailed: 'Ausstehende Änderungen konnten nicht geladen werden:',
       empty: 'Nichts ausstehend — alle Entwürfe wurden veröffentlicht.',
 
@@ -3953,6 +3953,8 @@ const en = {
     changes: {
       title: 'Pending changes',
       description: 'What publishing will change. New items are added; updates overwrite the live version.',
+      // ADR-0146 D3 — where a customization of a read-only base is saved: its `.custom` pair.
+      savedToCustomization: 'Saved to {{package}}’s customizations',
       loading: 'Loading pending changes…',
       loadFailed: 'Could not load pending changes:',
       empty: 'Nothing pending — every draft has been published.',