* fix(email): include course name in student welcome subject The studentCourseWelcome template used a static subject, so bulk course assignments produced identical inbox titles. Resolve the subject from courseName at send time and sanitize it like other email headers. Co-authored-by: Rotimi Best <[email protected]> * fix(email): use course-only subject for student welcome email Co-authored-by: Rotimi Best <[email protected]> --------- Co-authored-by: Cursor Agent <[email protected]> Co-authored-by: Rotimi Best <[email protected]>