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 <[email protected]>

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

Co-authored-by: Rotimi Best <[email protected]>

* 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 <[email protected]>

* 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 <[email protected]>

---------

Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: Rotimi Best <[email protected]>

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

@@ -242,6 +242,10 @@
         "unpinned": "Odpięty",
         "successfully": "Pomyślnie",
         "feed_delete_success": "Kanał został pomyślnie usunięty"
+      },
+      "people": {
+        "progress_reset": "Postęp został zresetowany",
+        "progress_reset_failed": "Nie udało się zresetować postępu"
       }
     },
     "landing_page_settings": {
@@ -1100,6 +1104,26 @@
           "no": "Nie",
           "yes": "Tak"
         },
+        "reset_progress": {
+          "button": "Zresetuj postęp",
+          "dialog": {
+            "title": "Zresetować postęp użytkownika {studentName}?",
+            "intro": "Spowoduje to trwałe usunięcie postępu tego uczestnika w tym kursie. Pozostanie zapisany i będzie mógł zacząć od lekcji 1.",
+            "bullets": {
+              "lessons": "Ukończone lekcje — {completed} z {total}",
+              "exercises": "Przesłane ćwiczenia — {count} zgłoszeń",
+              "comments": "Komentarze do lekcji tego uczestnika — {count}",
+              "newsfeed": "Wpisy i odpowiedzi na kanale kursu tego uczestnika — {count}",
+              "video_progress": "Postęp oglądania wideo — {count} śledzonych lekcji",
+              "attendance": "Wpisy obecności — {count}",
+              "certificate_yes": "Rekordy certyfikacji/zgodności — tak",
+              "certificate_no": "Rekordy certyfikacji/zgodności — nie"
+            },
+            "warning": "Tej operacji nie można cofnąć.",
+            "cancel": "Anuluj",
+            "confirm": "Usuń"
+          }
+        },
         "invite_modal": {
           "title": "Zaproś ludzi",
           "invite": "Zaproś korepetytorów",