fix(lunch): reminder filter, recap failure surfacing, manual send-reminders

- Extract selectUnpickedAttendees helper with OR filter (is null OR pickedAt null)
  to fix cron missing attendees with no MemberLunchPick row at all
- Update cron route to use the helper
- sendRecap now throws TRPCError on email failure instead of silently stamping success
- Add lunch.sendReminders adminProcedure for manual on-demand reminder sends
- Add "Send reminders now" AlertDialog button to LunchRecapActions
- Tests: lunch-reminder-filter.test.ts (2 new), all 5 lunch test files pass (40 tests)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/api/cron/lunch-reminders/route.ts

@@ -1,6 +1,7 @@
 import { NextResponse, type NextRequest } from 'next/server'
 import { prisma } from '@/lib/prisma'
 import { sendLunchReminderEmail } from '@/lib/email'
+import { selectUnpickedAttendees } from '@/server/services/lunch-reminders'
 
 /**
  * Cron: send a single reminder email per attending member who hasn't picked
@@ -35,16 +36,7 @@ export async function GET(request: NextRequest): Promise<NextResponse> {
       )
       if (now < reminderAt || now >= deadline) continue
 
-      const ams = await prisma.attendingMember.findMany({
-        where: {
-          confirmation: {
-            project: { programId: event.programId },
-            status: 'CONFIRMED',
-          },
-          lunchPick: { is: { pickedAt: null } },
-        },
-        include: { user: { select: { name: true, email: true } } },
-      })
+      const ams = await selectUnpickedAttendees(prisma, event)
       for (const am of ams) {
         if (!am.user.email) continue
         try {