Fix admin getting juror assignment email on reshuffle/COI

notifyAdmins was using BATCH_ASSIGNED notification type, which triggers
the juror assignment email template ('X Projects Assigned'). Admins
received confusing emails that looked like they were assigned projects.

Changed to EVALUATION_MILESTONE type for admin-facing reshuffle/COI
notifications. Also included top receivers in admin notification message.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server/routers/assignment.ts

@@ -150,10 +150,11 @@ export async function reassignAfterCOI(params: {
 
   // Notify admins of the reassignment
   await notifyAdmins({
-    type: NotificationTypes.BATCH_ASSIGNED,
+    type: NotificationTypes.EVALUATION_MILESTONE,
     title: 'COI Auto-Reassignment',
     message: `Project "${assignment.project.title}" was reassigned from ${assignment.user.name || assignment.user.email} to ${replacement.name || replacement.email} due to conflict of interest.`,
     linkUrl: `/admin/rounds/${roundId}`,
+    linkLabel: 'View Round',
     metadata: {
       projectId,
       oldJurorId: assignment.userId,
@@ -447,10 +448,11 @@ async function reassignDroppedJurorAssignments(params: {
       .join(', ')
 
     await notifyAdmins({
-      type: NotificationTypes.BATCH_ASSIGNED,
+      type: NotificationTypes.EVALUATION_MILESTONE,
       title: 'Juror Dropout Reshuffle',
-      message: `Reassigned ${actualMoves.length} project(s) from ${droppedName}. ${failedProjects.length > 0 ? `${failedProjects.length} project(s) could not be reassigned.` : 'All projects were reassigned.'}`,
+      message: `Reassigned ${actualMoves.length} project(s) from ${droppedName} to: ${topReceivers}. ${failedProjects.length > 0 ? `${failedProjects.length} project(s) could not be reassigned.` : 'All projects were reassigned successfully.'}`,
       linkUrl: `/admin/rounds/${round.id}`,
+      linkLabel: 'View Round',
       metadata: {
         roundId: round.id,
         droppedJurorId: droppedJuror.id,