Add per-juror notify button in Jury Progress section

Adds a mail icon on hover for each juror row in the Jury Progress
table, allowing admins to send assignment notifications to individual
jurors instead of only bulk-notifying all at once.

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

src/server/routers/assignment.ts

@@ -1466,4 +1466,58 @@ export const assignmentRouter = router({
 
       return { sent: totalSent, jurorCount: Object.keys(userCounts).length }
     }),
+
+  notifySingleJurorOfAssignments: adminProcedure
+    .input(z.object({ roundId: z.string(), userId: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const round = await ctx.prisma.round.findUniqueOrThrow({
+        where: { id: input.roundId },
+        select: { name: true, windowCloseAt: true },
+      })
+
+      const assignments = await ctx.prisma.assignment.findMany({
+        where: { roundId: input.roundId, userId: input.userId },
+        select: { id: true },
+      })
+
+      if (assignments.length === 0) {
+        throw new TRPCError({ code: 'NOT_FOUND', message: 'No assignments found for this juror in this round' })
+      }
+
+      const projectCount = assignments.length
+      const deadline = round.windowCloseAt
+        ? new Date(round.windowCloseAt).toLocaleDateString('en-US', {
+            weekday: 'long',
+            year: 'numeric',
+            month: 'long',
+            day: 'numeric',
+          })
+        : undefined
+
+      await createBulkNotifications({
+        userIds: [input.userId],
+        type: NotificationTypes.BATCH_ASSIGNED,
+        title: `${projectCount} Projects Assigned`,
+        message: `You have been assigned ${projectCount} project${projectCount > 1 ? 's' : ''} to evaluate for ${round.name || 'this round'}.`,
+        linkUrl: `/jury/competitions`,
+        linkLabel: 'View Assignments',
+        metadata: { projectCount, roundName: round.name, deadline },
+      })
+
+      await logAudit({
+        prisma: ctx.prisma,
+        userId: ctx.user.id,
+        action: 'NOTIFY_SINGLE_JUROR_OF_ASSIGNMENTS',
+        entityType: 'Round',
+        entityId: input.roundId,
+        detailsJson: {
+          targetUserId: input.userId,
+          assignmentCount: projectCount,
+        },
+        ipAddress: ctx.ip,
+        userAgent: ctx.userAgent,
+      })
+
+      return { sent: 1, projectCount }
+    }),
 })