* fix(dashboard): fix instructor avatar upload on course landing page
The crop dialog was hidden behind the full-screen (z-250) landing-page
editor because bits-ui portals it to <body> at z-modal (200), and every
crop triggered an unbounded loop of POST /media/image requests.
- Add opt-in `elevatedDialog` prop to UploadImage that raises the crop
dialog above the editor takeover; enable it in the instructor,
certificate, and review landing-page editor forms.
- Break the upload effect loop in instructor-form by reading `course.id`
through `untrack`, so the effect no longer re-runs when the setter
reassigns `course` after each unique upload URL.
- Handle upload failures in instructor-form with a snackbar and always
reset `isUploading`, so a failed upload no longer leaves the widget
stuck and silent.
* docs(email): add email notification preferences PRD
Specify a Settings feature letting users enable/disable notification emails at two scopes: personal per-user preferences and org-wide admin defaults. Both gates must allow a send; transactional emails stay mandatory. Grounds storage in organization.settings and a new profile.settings jsonb, with a single preference guard at the email enqueue chokepoint.
