fix: include relation field diffs in timeline activities

https://sonarly.com/issue/41112?type=bug

Timeline updates omit MANY_TO_ONE relation changes, and relation-only updates can produce no visible activity entry at all. This breaks audit-trail completeness for common CRM edits.

Fix: Implemented a backend fix so relation changes are included in timeline update diffs and relation-only updates are no longer dropped as empty diffs.

What changed:
1) `packages/twenty-server/src/engine/core-modules/event-emitter/utils/object-record-changed-values.ts`
- Stopped excluding `FieldMetadataType.RELATION` from diff generation.
- Used both maps from `buildFieldMapsFromFlatObjectMetadata`:
  - `fieldIdByName`
  - `fieldIdByJoinColumnName`
- Added normalization of diff keys to metadata field names (`diffKey = field?.name ?? key`), so MANY_TO_ONE join column updates like `companyId` are emitted as `company`.
- Kept POSITION filtering intact.

This fixes both:
- missing relation diffs in update activities
- relation-only updates being filtered out downstream as empty diffs
and avoids frontend metadata lookup failures due to `...Id` diff keys.

2) `packages/twenty-server/src/engine/core-modules/event-emitter/utils/__tests__/object-record-changed-values.spec.ts`
- Added test: includes relation-field changes in diff.
- Added test: normalizes MANY_TO_ONE join-column changes (`companyId`) to relation field name (`company`) in diff output.
- Retained existing POSITION-ignore behavior test.

Validation attempts:
- Tried running:
  `npx jest packages/twenty-server/src/engine/core-modules/event-emitter/utils/__tests__/object-record-changed-values.spec.ts --config=packages/twenty-server/jest.config.mjs`
- Blocked by environment dependency resolution error: `Cannot find module 'file-type'` from Jest config.

Authored by Sonarly by autonomous analysis (run 46864).

packages/twenty-server/src/engine/core-modules/event-emitter/utils/__tests__/object-record-changed-values.spec.ts

@@ -1,4 +1,4 @@
-import { FieldMetadataType } from 'twenty-shared/types';
+import { FieldMetadataType, RelationType } from 'twenty-shared/types';
 
 import { objectRecordChangedValues } from 'src/engine/core-modules/event-emitter/utils/object-record-changed-values';
 import { type FlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-maps.type';
@@ -151,6 +151,101 @@ describe('objectRecordChangedValues', () => {
     expect(result).toEqual(expectedChanges);
   });
 
+  it('includes changes to RELATION fields', () => {
+    const relationFieldId = 'company-field-id';
+    const relationUniversalId = 'company-universal-id';
+
+    const objectMetadataWithRelation: FlatObjectMetadata = {
+      ...mockObjectMetadata,
+      fieldIds: [relationFieldId],
+    };
+
+    const flatFieldMetadataMapsWithRelation: FlatEntityMaps<FlatFieldMetadata> =
+      {
+        byUniversalIdentifier: {
+          [relationUniversalId]: {
+            id: relationFieldId,
+            name: 'company',
+            type: FieldMetadataType.RELATION,
+            settings: { relationType: RelationType.MANY_TO_ONE },
+            universalIdentifier: relationUniversalId,
+          } as FlatFieldMetadata,
+        },
+        universalIdentifierById: {
+          [relationFieldId]: relationUniversalId,
+        },
+        universalIdentifiersByApplicationId: {},
+      };
+
+    const oldRecord = {
+      id: '74316f58-29b0-4a6a-b8fa-d2b506d5516m',
+      company: { id: 'company-1' },
+    };
+    const newRecord = {
+      id: '74316f58-29b0-4a6a-b8fa-d2b506d5516m',
+      company: { id: 'company-2' },
+    };
+
+    const result = objectRecordChangedValues(
+      oldRecord,
+      newRecord,
+      objectMetadataWithRelation,
+      flatFieldMetadataMapsWithRelation,
+    );
+
+    expect(result).toEqual({
+      company: { before: { id: 'company-1' }, after: { id: 'company-2' } },
+    });
+  });
+
+  it('normalizes MANY_TO_ONE join column changes to relation field names', () => {
+    const relationFieldId = 'company-field-id';
+    const relationUniversalId = 'company-universal-id';
+
+    const objectMetadataWithRelation: FlatObjectMetadata = {
+      ...mockObjectMetadata,
+      fieldIds: [relationFieldId],
+    };
+
+    const flatFieldMetadataMapsWithRelation: FlatEntityMaps<FlatFieldMetadata> =
+      {
+        byUniversalIdentifier: {
+          [relationUniversalId]: {
+            id: relationFieldId,
+            name: 'company',
+            type: FieldMetadataType.RELATION,
+            settings: { relationType: RelationType.MANY_TO_ONE },
+            universalIdentifier: relationUniversalId,
+          } as FlatFieldMetadata,
+        },
+        universalIdentifierById: {
+          [relationFieldId]: relationUniversalId,
+        },
+        universalIdentifiersByApplicationId: {},
+      };
+
+    const oldRecord = {
+      id: '74316f58-29b0-4a6a-b8fa-d2b506d5516m',
+      companyId: 'company-1',
+    };
+    const newRecord = {
+      id: '74316f58-29b0-4a6a-b8fa-d2b506d5516m',
+      companyId: 'company-2',
+    };
+
+    const result = objectRecordChangedValues(
+      oldRecord,
+      newRecord,
+      objectMetadataWithRelation,
+      flatFieldMetadataMapsWithRelation,
+    );
+
+    expect(result).toEqual({
+      company: { before: 'company-1', after: 'company-2' },
+    });
+    expect(result).not.toHaveProperty('companyId');
+  });
+
   it('ignores changes to POSITION fields', () => {
     const positionFieldId = 'position-field-id';
     const positionUniversalId = 'position-universal-id';

packages/twenty-server/src/engine/core-modules/event-emitter/utils/object-record-changed-values.ts

@@ -13,20 +13,19 @@ export const objectRecordChangedValues = (
   objectMetadataItem: FlatObjectMetadata,
   flatFieldMetadataMaps: FlatEntityMaps<FlatFieldMetadata>,
 ) => {
-  const { fieldIdByName } = buildFieldMapsFromFlatObjectMetadata(
-    flatFieldMetadataMaps,
-    objectMetadataItem,
-  );
+  const { fieldIdByName, fieldIdByJoinColumnName } =
+    buildFieldMapsFromFlatObjectMetadata(flatFieldMetadataMaps, objectMetadataItem);
 
   return Object.keys(newRecord).reduce(
     (acc, key) => {
-      const fieldId = fieldIdByName[key];
+      const fieldId = fieldIdByName[key] ?? fieldIdByJoinColumnName[key];
       const field = fieldId
         ? findFlatEntityByIdInFlatEntityMaps({
             flatEntityId: fieldId,
             flatEntityMaps: flatFieldMetadataMaps,
           })
         : undefined;
+      const diffKey = field?.name ?? key;
 
       const oldRecordValue = oldRecord[key];
       const newRecordValue = newRecord[key];
@@ -34,7 +33,6 @@ export const objectRecordChangedValues = (
       if (
         key === 'updatedAt' ||
         key === 'searchVector' ||
-        field?.type === FieldMetadataType.RELATION ||
         field?.type === FieldMetadataType.POSITION
       ) {
         return acc;
@@ -44,7 +42,7 @@ export const objectRecordChangedValues = (
         return acc;
       }
 
-      acc[key] = { before: oldRecordValue, after: newRecordValue };
+      acc[diffKey] = { before: oldRecordValue, after: newRecordValue };
 
       return acc;
     },