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* 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 <rotimi-best@users.noreply.github.com> * fix(email): use course-only subject for student welcome email Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com> --------- Co-authored-by: Cursor Agent <cursoragent@cursor.com> Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>