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Adds the #70 follow-up onto the student detail page: studio admins can now cancel an upcoming lesson (same path as student cancellation — slot freed, pending payment voided), withdraw an active group-class enrolment (seat freed, pending payment voided), and edit the student's display name and email with validation and uniqueness checks. Action logic lives in the new Auth\StudentActions (unit-tested with mocked repositories); the controller routes nonce-protected POSTs to it and shows success/error notices. Closes #70 Co-Authored-By: Claude Fable 5 <[email protected]>