Add juror quick actions to Members section, redistribute button, dropout emails, and transfer duplicate detection

- Add mail/transfer/reshuffle/redistribute icons to each juror row in Members card
- New redistributeJurorAssignments procedure: reassign all pending projects without dropping juror from group
- New DROPOUT_REASSIGNED email template with project names, deadline, and dropped juror context
- Update reassignDroppedJuror to send per-juror DROPOUT_REASSIGNED emails instead of generic BATCH_ASSIGNED
- Transfer dialog now shows all candidates with "Already assigned" / "At cap" labels instead of hiding them
- SQL script for prod DB insertion of new notification setting without seeding

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

src/components/admin/assignment/transfer-assignments-dialog.tsx

@@ -273,19 +273,28 @@ export function TransferAssignmentsDialog({
                           value={currentDest}
                           onValueChange={(v) => setDestOverrides((prev) => ({ ...prev, [assignment.id]: v }))}
                         >
-                          <SelectTrigger className="w-[200px] h-8 text-xs">
+                          <SelectTrigger className="w-[220px] h-8 text-xs">
                             <SelectValue placeholder="Select juror" />
                           </SelectTrigger>
                           <SelectContent>
-                            {candidateData.candidates
-                              .filter((c) => c.eligibleProjectIds.includes(assignment.projectId))
-                              .map((c) => (
-                                <SelectItem key={c.userId} value={c.userId}>
+                            {candidateData.candidates.map((c) => {
+                              const isEligible = c.eligibleProjectIds.includes(assignment.projectId)
+                              const alreadyHas = c.alreadyAssignedProjectIds?.includes(assignment.projectId)
+                              return (
+                                <SelectItem
+                                  key={c.userId}
+                                  value={c.userId}
+                                  disabled={!isEligible}
+                                  className={cn(!isEligible && 'opacity-50')}
+                                >
                                   <span>{c.name}</span>
                                   <span className="text-muted-foreground ml-1">({c.currentLoad}/{c.cap})</span>
                                   {c.allCompleted && <span className="text-emerald-600 ml-1">Done</span>}
+                                  {alreadyHas && <span className="text-amber-600 ml-1">Already assigned</span>}
+                                  {!isEligible && !alreadyHas && c.currentLoad >= c.cap && <span className="text-red-500 ml-1">At cap</span>}
                                 </SelectItem>
-                              ))}
+                              )
+                            })}
                           </SelectContent>
                         </Select>
                       </div>