feat(course): reset student course progress (#671)

* feat(course): add reset student course progress action

Give course admins and tutors a destructive reset-progress flow on the
student people detail page. The backend clears learner progress for one
(courseId, memberId) pair in a single transaction while keeping the
groupmember enrolled, and logs an audit summary. The dashboard shows a
confirmation dialog with impact counts from analytics before deleting.

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(i18n): add localized reset progress strings for all locales

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(course): scope reset progress to course data only

Stop deleting org-level community questions and answers during course
progress reset. Fix course newsfeed deletion order so comments on a
student's posts are removed before the posts themselves. Restrict reset
to student members, move analytics loading to the person detail layout,
and rename impact copy to course newsfeed only.

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(course): address Greptile review on reset progress

Make progressImpact opt-in via includeProgressImpact query param so
analytics requests avoid extra DB work unless the reset dialog needs it.
Count only student-authored course newsfeed posts and comments in the
impact summary to avoid double-counting replies on the student's posts.

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>

apps/dashboard/src/lib/utils/translations/da.json

@@ -242,6 +242,10 @@
         "unpinned": "Frigjort",
         "successfully": "Med succes",
         "feed_delete_success": "Feedet blev slettet"
+      },
+      "people": {
+        "progress_reset": "Fremskridt nulstillet",
+        "progress_reset_failed": "Kunne ikke nulstille fremskridt"
       }
     },
     "landing_page_settings": {
@@ -1100,6 +1104,26 @@
           "no": "Nej",
           "yes": "Ja"
         },
+        "reset_progress": {
+          "button": "Nulstil fremskridt",
+          "dialog": {
+            "title": "Nulstil fremskridt for {studentName}?",
+            "intro": "Dette sletter permanent denne elevs fremskridt i dette kursus. Eleven forbliver tilmeldt og kan starte forfra fra lektion 1.",
+            "bullets": {
+              "lessons": "Gennemførte lektioner — {completed} af {total}",
+              "exercises": "Afleverede øvelser — {count} afleveringer",
+              "comments": "Lektionskommentarer fra denne elev — {count}",
+              "newsfeed": "Kursusnyhedsfeed-opslag og svar fra denne elev — {count}",
+              "video_progress": "Videofremskridt — {count} lektioner sporet",
+              "attendance": "Fremmødeposter — {count}",
+              "certificate_yes": "Certificerings-/compliance-data — ja",
+              "certificate_no": "Certificerings-/compliance-data — nej"
+            },
+            "warning": "Dette kan ikke fortrydes.",
+            "cancel": "Annuller",
+            "confirm": "Slet"
+          }
+        },
         "invite_modal": {
           "title": "Inviter folk",
           "invite": "Inviter undervisere",