fix: use correct labels and icons for Note/Task relations on custom objects

https://sonarly.com/issue/20169?type=bug

When creating custom Data Model objects, the auto-generated Note and Task relation fields use the raw object plural labels ("Note Targets", "Task Targets") and a hardcoded generic icon (`IconBuildingSkyscraper`) instead of the user-friendly labels ("Notes", "Tasks") and appropriate icons (`IconNotes`, `IconCheckbox`) used by standard objects.

Fix: Added a `sourceFieldOverridesByRelationObjectNameSingular` mapping that provides the correct user-friendly labels and icons for each default relation type on custom objects, matching exactly what standard objects (Company, Person, etc.) use:

- `noteTarget` → label "Notes", icon "IconNotes" (was "Note Targets" / "IconBuildingSkyscraper")
- `taskTarget` → label "Tasks", icon "IconCheckbox" (was "Task Targets" / "IconBuildingSkyscraper")
- `attachment` → label "Attachments", icon "IconFileImport" (was "Attachments" / "IconBuildingSkyscraper")
- `timelineActivity` → label "Timeline Activities", icon "IconTimelineEvent" (was "Timeline Activities" / "IconBuildingSkyscraper")
- `favorite` → label "Favorites", icon "IconHeart" (was "Favorites" / "IconBuildingSkyscraper")

The map is typed as `Record<(typeof DEFAULT_RELATIONS_OBJECTS_STANDARD_IDS)[number], ...>` so the compiler will require an entry for any new default relation object added in the future.

**Note:** This fix only applies to newly created custom objects. Existing custom objects that already have the wrong labels and icons will retain them. A data migration or upgrade command would be needed to fix existing custom objects.

packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/build-default-relation-flat-field-metadatas-for-custom-object.util.ts

@@ -21,6 +21,20 @@ import { STANDARD_OBJECT_ICONS } from 'src/engine/workspace-manager/workspace-mi
 import { type UniversalFlatFieldMetadata } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-field-metadata.type';
 import { type UniversalFlatObjectMetadata } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-object-metadata.type';
 
+const sourceFieldOverridesByRelationObjectNameSingular: Record<
+  (typeof DEFAULT_RELATIONS_OBJECTS_STANDARD_IDS)[number],
+  { label: string; icon: string }
+> = {
+  noteTarget: { label: 'Notes', icon: 'IconNotes' },
+  taskTarget: { label: 'Tasks', icon: 'IconCheckbox' },
+  attachment: { label: 'Attachments', icon: 'IconFileImport' },
+  timelineActivity: {
+    label: 'Timeline Activities',
+    icon: 'IconTimelineEvent',
+  },
+  favorite: { label: 'Favorites', icon: 'IconHeart' },
+};
+
 const morphIdByRelationObjectNameSingular = {
   timelineActivity:
     STANDARD_OBJECTS.timelineActivity.morphIds.targetMorphId.morphId,
@@ -120,10 +134,16 @@ export const buildDefaultRelationFlatFieldMetadatasForCustomObject = ({
             morphId,
             targetFieldName: fieldName,
             createFieldInput: {
-              icon: 'IconBuildingSkyscraper',
+              icon:
+                sourceFieldOverridesByRelationObjectNameSingular[
+                  objectMetadataNameSingular
+                ].icon,
               type: FieldMetadataType.RELATION,
               name: targetFlatObjectMetadata.namePlural,
-              label: capitalize(targetFlatObjectMetadata.labelPlural),
+              label:
+                sourceFieldOverridesByRelationObjectNameSingular[
+                  objectMetadataNameSingular
+                ].label,
               isSystem: false,
               relationCreationPayload: {
                 type: RelationType.ONE_TO_MANY,