refactor(yachts): use withTransaction helper per project convention

src/lib/services/yachts.service.ts

@@ -5,6 +5,7 @@ import { companies } from '@/lib/db/schema/companies';
 import { createAuditLog } from '@/lib/audit';
 import { NotFoundError, ValidationError } from '@/lib/errors';
 import { emitToRoom } from '@/lib/socket/server';
+import { withTransaction } from '@/lib/db/utils';
 import type { z } from 'zod';
 import type { createYachtSchema } from '@/lib/validators/yachts';
 
@@ -36,8 +37,8 @@ async function assertOwnerExists(
 }
 
 export async function createYacht(portId: string, data: CreateYachtInput, meta: AuditMeta) {
-  return await db.transaction(async (tx) => {
-    await assertOwnerExists(portId, data.owner, tx as unknown as typeof db);
+  return await withTransaction(async (tx) => {
+    await assertOwnerExists(portId, data.owner, tx);
 
     const [yacht] = await tx
       .insert(yachts)