Reset Tab Page Layout (#19453)

## Context
- Add "Reset to default" for page layout tabs and widgets — backend
mutation resets overrides, reactivates deactivated children, and deletes
custom children
- Fix override write bug where mutating an overridable property (e.g.
widget title) on a standard-app entity incorrectly overwrote the base
column instead of writing to the overrides JSONB —
PageLayoutUpdateService now uses resolveFlatEntityOverridableProperties
for accurate diffing and routes properties through
sanitizeOverridableEntityInput
- Deprecate isOverridden - We need more time to think about this
feature. Currently this adds too much complexity for a very small
benefit



https://github.com/user-attachments/assets/a84546c8-1e15-4d9e-a489-0825cf8b8ed2

packages/twenty-front/src/modules/page-layout/components/__stories__/PageLayoutRenderer.stories.tsx

@@ -68,7 +68,6 @@ const mixedGraphsPageLayoutMocks = {
       title: 'Mixed Graphs',
       position: 0,
       pageLayoutId: 'mixed-graphs-layout',
-      isOverridden: false,
       createdAt: '2024-01-01T00:00:00Z',
       updatedAt: '2024-01-01T00:00:00Z',
       deletedAt: null,
@@ -93,7 +92,6 @@ const mixedGraphsPageLayoutMocks = {
             aggregateOperation: AggregateOperations.COUNT,
             aggregateFieldMetadataId: idField.id,
           },
-          isOverridden: false,
           createdAt: '2024-01-01T00:00:00Z',
           updatedAt: '2024-01-01T00:00:00Z',
           deletedAt: null,
@@ -119,7 +117,6 @@ const mixedGraphsPageLayoutMocks = {
             aggregateFieldMetadataId: idField.id,
             displayDataLabel: false,
           },
-          isOverridden: false,
           createdAt: '2024-01-01T00:00:00Z',
           updatedAt: '2024-01-01T00:00:00Z',
           deletedAt: null,
@@ -146,7 +143,6 @@ const mixedGraphsPageLayoutMocks = {
             groupByFieldMetadataId: createdAtField.id,
             orderBy: GraphOrderBy.VALUE_DESC,
           },
-          isOverridden: false,
           createdAt: '2024-01-01T00:00:00Z',
           updatedAt: '2024-01-01T00:00:00Z',
           deletedAt: null,
@@ -176,7 +172,6 @@ const mixedGraphsPageLayoutMocks = {
             axisNameDisplay: AxisNameDisplay.BOTH,
             displayDataLabel: false,
           } satisfies BarChartConfiguration,
-          isOverridden: false,
           createdAt: '2024-01-01T00:00:00Z',
           updatedAt: '2024-01-01T00:00:00Z',
           deletedAt: null,

packages/twenty-front/src/modules/page-layout/components/__stories__/PageLayoutTabList.stories.tsx

@@ -30,7 +30,6 @@ const createInitialTabs = (): PageLayoutTab[] => [
     icon: 'IconPlus',
     pageLayoutId: 'test-layout',
     widgets: [],
-    isOverridden: false,
     createdAt: new Date().toISOString(),
     updatedAt: new Date().toISOString(),
     deletedAt: null,
@@ -43,7 +42,6 @@ const createInitialTabs = (): PageLayoutTab[] => [
     position: 1,
     pageLayoutId: 'test-layout',
     widgets: [],
-    isOverridden: false,
     createdAt: new Date().toISOString(),
     updatedAt: new Date().toISOString(),
     deletedAt: null,
@@ -56,7 +54,6 @@ const createInitialTabs = (): PageLayoutTab[] => [
     position: 2,
     pageLayoutId: 'test-layout',
     widgets: [],
-    isOverridden: false,
     createdAt: new Date().toISOString(),
     updatedAt: new Date().toISOString(),
     deletedAt: null,
@@ -86,7 +83,6 @@ const PageLayoutTabListPlayground = ({
         position: nextIndex,
         pageLayoutId: 'test-layout',
         widgets: [],
-        isOverridden: false,
         createdAt: new Date().toISOString(),
         updatedAt: new Date().toISOString(),
         deletedAt: null,