fix(leads): give a new form lead the same owner as its first call

When a form has no round-robin assignees, the lead now follows the person the automation assigns to the first call.

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

apps/api/test/automation-branches.test.ts

@@ -10,6 +10,7 @@ import {
   type AutomationStep,
 } from '@mento/shared';
 import {
+  claimLeadAssignee,
   formatFormAnswers,
   pickRoundRobin,
   renderAutomationTemplate,
@@ -136,6 +137,13 @@ describe('اتوماسیون شاخه‌ای فرم', () => {
     );
   });
 
+  it('مسئول سرنخ فقط از اولین فعالیت دارای مسئول پر می‌شود', () => {
+    assert.equal(claimLeadAssignee(false, null), null);
+    assert.equal(claimLeadAssignee(false, '  '), null);
+    assert.equal(claimLeadAssignee(false, 'romina'), 'romina');
+    assert.equal(claimLeadAssignee(true, 'fatemeh'), null);
+  });
+
   it('تقسیم نوبتی مساوی و پایدار', () => {
     const team = ['u3', 'u1', 'u2'];
     const picks = [1, 2, 3, 4, 5, 6].map((n) => pickRoundRobin(team, n));