test(app-shell): hold the customization read pending in four landing tests; add the changeset

The landing now reads each read-only base's customizations. Four landing
tests that are not about it would send that read to a real socket, so they
stub the reader with a pending promise.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsR2jRL4qcnwHDD4M1e4wx

Author: claude

.changeset/28566-studio-landing-customization-counts.md

@@ -0,0 +1,18 @@
+---
+'@object-ui/app-shell': patch
+'@object-ui/i18n': patch
+---
+
+feat(app-shell): each read-only base's card on the Studio landing says "n customized, m switched off"
+
+Clause-②: yes (widening)
+Metadata-protocol: none
+
+Before an upgrade, or just to check, an administrator wants to see which installed apps they changed and what they switched off. Studio's landing now says it on each read-only base's card, for example "4 customized, 2 switched off" (zh 「已定制 4 项，已停用 2 项」).
+
+- **The numbers are the server's.** Each card reads `GET /api/v1/packages/:id/customizations` once. "Customized" is the served overrides plus the served extensions of the base's `<base>.custom` pair, and "switched off" is the served switched-off count. The answer is judged by `GetPackageCustomizationsResponseSchema`. An answer that schema refuses counts as a failed read.
+- **Zero only when the server answered.** While the read is pending, the line shows no number. A failed read shows a muted "Couldn't read customizations", with the server's sentence as its title, never "0".
+- **Links.** When the package list holds the base's pair, "n customized" opens the pair in Studio (`/studio/<base>.custom/data`). "m switched off" opens the base's Automations pillar.
+- **No line on a writable package or on a pair**, and a pair id is never sent: the route refuses one.
+- **The landing paints first.** The counts arrive after it.
+- **New strings.** `@object-ui/i18n`'s studio namespace gains seven `engine.studio.landing.customizations.*` keys in `en` and `zh`. The other languages fall back to `en`, as the whole namespace does. They interpolate `customized`, `switchedOff` and `pair`.

ui/packages/app-shell/src/views/studio-design/BuilderLanding.accessibleNames-12510.test.tsx

@@ -27,6 +27,11 @@ vi.mock('./packages-io', async (importOriginal) => {
 
 // The create dialog is closed throughout; its own names are pinned beside it.
 vi.mock('../metadata-admin/PackageFormDialog', () => ({ PackageFormDialog: () => null }));
+// A read-only base's customization read (ADR-0146 D3) is not under test here:
+// it stays pending, so no request leaves the file.
+vi.mock('./packageCustomizations-io', () => ({
+  fetchPackageCustomizationCounts: vi.fn(() => new Promise<never>(() => {})),
+}));
 
 import { BuilderLanding } from './BuilderLanding';
 import { RecentItemsProvider } from '../../context/RecentItemsProvider';

ui/packages/app-shell/src/views/studio-design/BuilderLanding.orgScope-11553.test.tsx

@@ -25,6 +25,11 @@ vi.mock('./packages-io', async (importOriginal) => {
 
 // The create dialog is closed throughout; its form stack is not under test.
 vi.mock('../metadata-admin/PackageFormDialog', () => ({ PackageFormDialog: () => null }));
+// A read-only base's customization read (ADR-0146 D3) is not under test here:
+// it stays pending, so no request leaves the file.
+vi.mock('./packageCustomizations-io', () => ({
+  fetchPackageCustomizationCounts: vi.fn(() => new Promise<never>(() => {})),
+}));
 
 import { BuilderLanding } from './BuilderLanding';
 

ui/packages/app-shell/src/views/studio-design/BuilderLanding.recentPackages-11863.test.tsx

@@ -46,6 +46,11 @@ vi.mock('./packages-io', async (importOriginal) => {
 
 // The create dialog is closed throughout; its form stack is not under test.
 vi.mock('../metadata-admin/PackageFormDialog', () => ({ PackageFormDialog: () => null }));
+// A read-only base's customization read (ADR-0146 D3) is not under test here:
+// it stays pending, so no request leaves the file.
+vi.mock('./packageCustomizations-io', () => ({
+  fetchPackageCustomizationCounts: vi.fn(() => new Promise<never>(() => {})),
+}));
 
 import { BuilderLanding } from './BuilderLanding';
 import { RecentItemsProvider } from '../../context/RecentItemsProvider';

ui/packages/app-shell/src/views/studio-design/BuilderLanding.setupExit-12513.test.tsx

@@ -21,6 +21,11 @@ vi.mock('./packages-io', async (importOriginal) => {
 
 // The create dialog is closed throughout; its form stack is not under test.
 vi.mock('../metadata-admin/PackageFormDialog', () => ({ PackageFormDialog: () => null }));
+// A read-only base's customization read (ADR-0146 D3) is not under test here:
+// it stays pending, so no request leaves the file.
+vi.mock('./packageCustomizations-io', () => ({
+  fetchPackageCustomizationCounts: vi.fn(() => new Promise<never>(() => {})),
+}));
 
 import { BuilderLanding, packagedAutomationPath } from './BuilderLanding';