* 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>
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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>
