Add admin study user enrollment list

server.js

@@ -2931,6 +2931,29 @@ app.get('/api/admin-stats', requireAdminAuth, (_req, res) => {
       count: enrollmentCountsBySlug[study.slug] ?? 0,
     }))
     .sort((a, b) => b.count - a.count)
+  const studyCatalogBySlug = new Map(getStudyCatalog().map(study => [study.slug, study]))
+  const users = studyUsers
+    .map(user => {
+      const enrolledStudySlugs = Array.isArray(user?.enrolledStudySlugs) ? user.enrolledStudySlugs : []
+      const enrolledStudies = enrolledStudySlugs
+        .map(slug => {
+          const study = studyCatalogBySlug.get(slug)
+          if (!study) return null
+          return { slug: study.slug, title: study.title }
+        })
+        .filter(Boolean)
+
+      return {
+        id: user.id,
+        username: user.username,
+        displayName: user.displayName ?? '',
+        enrolledStudies,
+      }
+    })
+    .sort((a, b) => {
+      if (b.enrolledStudies.length !== a.enrolledStudies.length) return b.enrolledStudies.length - a.enrolledStudies.length
+      return a.username.localeCompare(b.username)
+    })
   const enrolledUsers = studyUsers.filter(user => (user.enrolledStudySlugs?.length ?? 0) > 0).length
   const totalEnrollments = Object.values(enrollmentCountsBySlug).reduce((sum, count) => sum + count, 0)
 
@@ -2978,6 +3001,7 @@ app.get('/api/admin-stats', requireAdminAuth, (_req, res) => {
       enrolledUsers,
       totalEnrollments,
       enrollmentsByStudy,
+      users,
     },
   })
 })