fix(jira): correct user_find_by_user_string kwarg breaking account-id auto-detection

atlassian-python-api takes limit, not maxResults. The TypeError was
silently swallowed at DEBUG level, so every non-admin user's Jira
account-id lookup failed even with a valid email and working admin
Jira connection.

backend/tests/test_jira_service.py

@@ -277,3 +277,51 @@ def test_search_jira_issues_maps_fields(mock_get_client):
     assert results[0]["summary"] == "Test issue"
     assert results[0]["status"] == "In Progress"
     mock_jira.jql.assert_called_once()
+
+
+def _make_user(**overrides):
+    from app.models.user import User
+    u = MagicMock(spec=User)
+    u.username = "gerardo-ruiz"
+    u.email = "gerardo.ruiz@kaseya.com"
+    u.jira_account_id = None
+    for k, v in overrides.items():
+        setattr(u, k, v)
+    return u
+
+
+@patch("app.services.jira_service.has_admin_jira_configured", return_value=True)
+@patch("app.services.jira_service.get_admin_jira_client")
+def test_lookup_user_jira_account_id_calls_with_valid_kwargs(mock_get_client, mock_configured, db):
+    # Regression test: atlassian-python-api's user_find_by_user_string() takes
+    # `limit`, not `maxResults` — passing maxResults raised a TypeError that
+    # was silently swallowed, so the lookup always failed even with a valid
+    # email and a working admin Jira connection.
+    mock_jira = MagicMock()
+    mock_jira.user_find_by_user_string.return_value = [
+        {"emailAddress": "gerardo.ruiz@kaseya.com", "accountId": "abc123"}
+    ]
+    mock_get_client.return_value = mock_jira
+    user = _make_user()
+
+    updated = jira_service.lookup_user_jira_account_id(db, user)
+
+    mock_jira.user_find_by_user_string.assert_called_once_with(
+        query="gerardo.ruiz@kaseya.com", limit=10
+    )
+    assert updated is True
+    assert user.jira_account_id == "abc123"
+
+
+@patch("app.services.jira_service.has_admin_jira_configured", return_value=True)
+@patch("app.services.jira_service.get_admin_jira_client")
+def test_lookup_user_jira_account_id_no_match(mock_get_client, mock_configured, db):
+    mock_jira = MagicMock()
+    mock_jira.user_find_by_user_string.return_value = []
+    mock_get_client.return_value = mock_jira
+    user = _make_user()
+
+    updated = jira_service.lookup_user_jira_account_id(db, user)
+
+    assert updated is False
+    assert user.jira_account_id is None