Fix jury reminders, add notify jurors button, fix checkbox borders, widen assignment modal

- Send Reminders button now works: added sendManualReminders() that bypasses
  cron-specific window/deadline/dedup guards so admin can send immediately
- Added Notify Jurors button that sends direct BATCH_ASSIGNED emails to all
  jurors with assignments (not dependent on NotificationEmailSetting config)
- Fixed checkbox component: default border is now neutral grey (border-input),
  red border (border-primary) only applied when checked
- Widened Add Assignment dialog from max-w-2xl to max-w-3xl to prevent overflow

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

src/app/(admin)/admin/rounds/[roundId]/page.tsx

@@ -85,6 +85,7 @@ import {
   ShieldAlert,
   Eye,
   Pencil,
+  Mail,
 } from 'lucide-react'
 import {
   Command,
@@ -1784,9 +1785,10 @@ export default function RoundDetailPage() {
               <ScoreDistribution roundId={roundId} />
             </div>
 
-            {/* Actions: Send Reminders + Export */}
+            {/* Actions: Send Reminders + Notify + Export */}
             <div className="flex flex-wrap items-center gap-3">
               <SendRemindersButton roundId={roundId} />
+              <NotifyJurorsButton roundId={roundId} />
               <Button variant="outline" size="sm" onClick={() => setExportOpen(true)}>
                 <Download className="h-4 w-4 mr-1.5" />
                 Export Evaluations
@@ -2356,6 +2358,48 @@ function SendRemindersButton({ roundId }: { roundId: string }) {
   )
 }
 
+// ── Notify Jurors of Assignments Button ──────────────────────────────────
+
+function NotifyJurorsButton({ roundId }: { roundId: string }) {
+  const [open, setOpen] = useState(false)
+  const mutation = trpc.assignment.notifyJurorsOfAssignments.useMutation({
+    onSuccess: (data) => {
+      toast.success(`Notified ${data.jurorCount} juror(s) — ${data.emailsSent} email(s) sent`)
+      setOpen(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  return (
+    <>
+      <Button variant="outline" size="sm" onClick={() => setOpen(true)}>
+        <Mail className="h-4 w-4 mr-1.5" />
+        Notify Jurors
+      </Button>
+      <AlertDialog open={open} onOpenChange={setOpen}>
+        <AlertDialogContent>
+          <AlertDialogHeader>
+            <AlertDialogTitle>Notify jurors of their assignments?</AlertDialogTitle>
+            <AlertDialogDescription>
+              This will send an email to every juror assigned to this round, reminding them of how many projects they need to evaluate.
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel>Cancel</AlertDialogCancel>
+            <AlertDialogAction
+              onClick={() => mutation.mutate({ roundId })}
+              disabled={mutation.isPending}
+            >
+              {mutation.isPending && <Loader2 className="h-4 w-4 mr-1.5 animate-spin" />}
+              Notify Jurors
+            </AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
+    </>
+  )
+}
+
 // ── Export Evaluations Dialog ─────────────────────────────────────────────
 
 function ExportEvaluationsDialog({
@@ -2640,7 +2684,7 @@ function IndividualAssignmentsTable({
         if (!open) resetDialog()
         else setAddDialogOpen(true)
       }}>
-        <DialogContent className="sm:max-w-[540px]">
+        <DialogContent className="max-w-3xl">
           <DialogHeader>
             <DialogTitle>Add Assignment</DialogTitle>
             <DialogDescription>
@@ -2674,7 +2718,7 @@ function IndividualAssignmentsTable({
                     <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                   </Button>
                 </PopoverTrigger>
-                <PopoverContent className="w-[480px] p-0" align="start">
+                <PopoverContent className="w-[var(--radix-popover-trigger-width)] p-0" align="start">
                   <Command>
                     <CommandInput placeholder="Search by name or email..." />
                     <CommandList>
@@ -2775,7 +2819,7 @@ function IndividualAssignmentsTable({
               </div>
 
               {/* Project checklist */}
-              <ScrollArea className="h-[240px] rounded-md border">
+              <ScrollArea className="h-[320px] rounded-md border">
                 <div className="p-2 space-y-0.5">
                   {!selectedJurorId ? (
                     <p className="text-sm text-muted-foreground text-center py-8">