feat(awards): notify jurors on assignment + admin reminder button

The previous addJuror / bulkAddJurors / bulkInviteJurors flows silently
created AwardJuror rows with no notification when the user already had
an account. The result: assigned jurors had no idea they were assigned
unless they happened to log in and check /jury/awards manually.

Three changes:

1. New email template + sender (sendAwardJurorNotificationEmail). Tells
   the juror what the award is, how many projects are eligible, when
   voting closes, and links straight to /jury/awards/<id>. Reused for
   both the initial assignment notification and admin reminders.

2. Auto-send on assignment. addJuror / bulkAddJurors / bulkInviteJurors
   now send the email to newly-attached jurors. bulkInviteJurors checks
   for a prior AwardJuror row before sending so duplicate "Bulk Invite"
   clicks don't spam jurors who were already assigned. addJuror /
   bulkAddJurors accept a `sendEmail` flag so admin tooling can opt out.

3. New admin procedure specialAward.notifyJurors(awardId, userIds?,
   customMessage?). Surfaced in the Jurors tab as a "Send reminder to
   all" button at the top and a per-row mail icon for individual
   reminders. Audit-logged with action: 'JUROR_REMINDER'.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(admin)/admin/awards/[id]/page.tsx

@@ -513,6 +513,13 @@ export default function AwardDetailPage({
     },
     onError: (err) => toast.error(err.message),
   })
+  const notifyJurors = trpc.specialAward.notifyJurors.useMutation({
+    onSuccess: (data) => {
+      const failedNote = data.failed > 0 ? ` (${data.failed} failed)` : ''
+      toast.success(`Reminder sent to ${data.sent} of ${data.targeted} juror(s)${failedNote}`)
+    },
+    onError: (err) => toast.error(err.message),
+  })
   const setWinner = trpc.specialAward.setWinner.useMutation({
     onSuccess: invalidateAward,
   })
@@ -1335,7 +1342,7 @@ export default function AwardDetailPage({
 
         {/* Jurors Tab */}
         <TabsContent value="jurors" className="space-y-4">
-          <div className="flex gap-2">
+          <div className="flex flex-wrap items-center gap-2">
             <Select value={selectedJurorId} onValueChange={setSelectedJurorId}>
               <SelectTrigger className="w-64">
                 <SelectValue placeholder="Select a juror..." />
@@ -1355,6 +1362,19 @@ export default function AwardDetailPage({
               <UserPlus className="mr-2 h-4 w-4" />
               Add Juror
             </Button>
+            {jurors && jurors.length > 0 && (
+              <Button
+                variant="outline"
+                onClick={() => notifyJurors.mutate({ awardId })}
+                disabled={notifyJurors.isPending}
+                className="ml-auto"
+              >
+                <Mail className="mr-2 h-4 w-4" />
+                {notifyJurors.isPending
+                  ? 'Sending...'
+                  : `Send reminder to all (${jurors.length})`}
+              </Button>
+            )}
           </div>
 
           {/* Import from Jury Group */}
@@ -1549,11 +1569,23 @@ export default function AwardDetailPage({
                         />
                       </TableCell>
                       <TableCell className="text-right">
+                        <Button
+                          variant="ghost"
+                          size="sm"
+                          onClick={() =>
+                            notifyJurors.mutate({ awardId, userIds: [j.userId] })
+                          }
+                          disabled={notifyJurors.isPending}
+                          title="Send reminder email"
+                        >
+                          <Mail className="h-4 w-4" />
+                        </Button>
                         <Button
                           variant="ghost"
                           size="sm"
                           onClick={() => handleRemoveJuror(j.userId)}
                           disabled={removeJuror.isPending}
+                          title="Remove juror"
                         >
                           <X className="h-4 w-4" />
                         </Button>