[Breaking change] fix: make pageLayout type field required (#22450)

fixes https://github.com/twentyhq/twenty/issues/22251


**Summary**
- Fixes #22251 — NavigationMenuItem with type PAGE_LAYOUT returns 404
"Off track" for custom standalone pages
- Makes type a required field in PageLayoutManifest instead of relying
on a fallback default to RECORD_PAGE
- Adds PageLayoutType enum to twenty-shared and exports it from the SDK
for app developers
- Adds build-time validation in definePageLayout to reject manifests
missing type
- Updates the CLI add command to prompt users to select a page layout
type interactively

**Root cause**
When definePageLayout was called without type, the manifest converter
defaulted to RECORD_PAGE. The frontend route guard at /page/:id then
rejected it (only STANDALONE_PAGE is allowed), producing a 404.

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packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/__tests__/from-page-layout-manifest-to-universal-flat-page-layout.util.spec.ts

@@ -5,11 +5,12 @@ describe('fromPageLayoutManifestToUniversalFlatPageLayout', () => {
   const now = '2026-01-01T00:00:00.000Z';
   const applicationUniversalIdentifier = 'app-uuid-1';
 
-  it('should convert a minimal page layout manifest', () => {
+  it('should convert a standalone page layout manifest', () => {
     const result = fromPageLayoutManifestToUniversalFlatPageLayout({
       pageLayoutManifest: {
         universalIdentifier: 'pl-uuid-1',
         name: 'My Page Layout',
+        type: PageLayoutType.STANDALONE_PAGE,
       },
       applicationUniversalIdentifier,
       now,
@@ -20,7 +21,7 @@ describe('fromPageLayoutManifestToUniversalFlatPageLayout', () => {
       applicationUniversalIdentifier,
     );
     expect(result.name).toBe('My Page Layout');
-    expect(result.type).toBe(PageLayoutType.RECORD_PAGE);
+    expect(result.type).toBe(PageLayoutType.STANDALONE_PAGE);
     expect(result.objectMetadataUniversalIdentifier).toBeNull();
     expect(
       result.defaultTabToFocusOnMobileAndSidePanelUniversalIdentifier,
@@ -28,10 +29,27 @@ describe('fromPageLayoutManifestToUniversalFlatPageLayout', () => {
     expect(result.tabUniversalIdentifiers).toEqual([]);
   });
 
-  it('should convert a fully specified page layout manifest', () => {
+  it('should convert a record page layout manifest', () => {
     const result = fromPageLayoutManifestToUniversalFlatPageLayout({
       pageLayoutManifest: {
         universalIdentifier: 'pl-uuid-2',
+        name: 'Record Layout',
+        type: PageLayoutType.RECORD_PAGE,
+        objectUniversalIdentifier: 'obj-uuid-1',
+      },
+      applicationUniversalIdentifier,
+      now,
+    });
+
+    expect(result.name).toBe('Record Layout');
+    expect(result.type).toBe(PageLayoutType.RECORD_PAGE);
+    expect(result.objectMetadataUniversalIdentifier).toBe('obj-uuid-1');
+  });
+
+  it('should convert a fully specified page layout manifest', () => {
+    const result = fromPageLayoutManifestToUniversalFlatPageLayout({
+      pageLayoutManifest: {
+        universalIdentifier: 'pl-uuid-3',
         name: 'Dashboard Layout',
         type: PageLayoutType.DASHBOARD,
         objectUniversalIdentifier: 'obj-uuid-1',

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-page-layout-manifest-to-universal-flat-page-layout.util.ts

@@ -1,6 +1,6 @@
 import { type PageLayoutManifest } from 'twenty-shared/application';
 
-import { PageLayoutType } from 'src/engine/metadata-modules/page-layout/enums/page-layout-type.enum';
+import { type PageLayoutType } from 'src/engine/metadata-modules/page-layout/enums/page-layout-type.enum';
 import { type UniversalFlatPageLayout } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-page-layout.type';
 
 export const fromPageLayoutManifestToUniversalFlatPageLayout = ({
@@ -16,8 +16,7 @@ export const fromPageLayoutManifestToUniversalFlatPageLayout = ({
     universalIdentifier: pageLayoutManifest.universalIdentifier,
     applicationUniversalIdentifier,
     name: pageLayoutManifest.name,
-    type:
-      (pageLayoutManifest.type as PageLayoutType) ?? PageLayoutType.RECORD_PAGE,
+    type: pageLayoutManifest.type as PageLayoutType,
     objectMetadataUniversalIdentifier:
       pageLayoutManifest.objectUniversalIdentifier ?? null,
     defaultTabToFocusOnMobileAndSidePanelUniversalIdentifier: