Keep previous import source and code when a person is re-imported from another source

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/integrations/tahesab/person-link.service.ts

@@ -6,6 +6,7 @@ import {
 } from '@nestjs/common';
 import { Prisma } from '@prisma/client';
 import { PrismaService } from '../../prisma/prisma.service';
+import { carryPreviousSource } from '../../contacts/person-source';
 import { TahesabConnectionsService } from './connections.service';
 import {
   CreateInTahesabDto,
@@ -514,6 +515,7 @@ export class TahesabPersonLinkService {
                 previousLastName: prevLast || null,
               }
             : {}),
+          ...carryPreviousSource(existing, 'tahesab'),
           importSource: 'tahesab',
           sourceRef,
           ...(mobile
@@ -549,6 +551,7 @@ export class TahesabPersonLinkService {
                   previousLastName: byMobile.lastName || null,
                 }
               : {}),
+            ...carryPreviousSource(byMobile, 'tahesab'),
             importSource: 'tahesab',
             sourceRef,
           },