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/server/services/lunch-reminders.ts

@@ -0,0 +1,32 @@
+import type { PrismaClient } from '@prisma/client'
+
+/**
+ * Return all AttendingMember rows (with user) that:
+ *  - belong to a CONFIRMED FinalistConfirmation in the given program
+ *  - have NOT yet picked a lunch dish (no MemberLunchPick row OR pick row with pickedAt=null)
+ *
+ * This is extracted from the cron so it can be unit-tested independently and
+ * reused by the manual `sendReminders` admin action.
+ *
+ * Bug context: Prisma `lunchPick: { is: { pickedAt: null } }` only matches rows
+ * that EXIST but have pickedAt=null.  Attendees with no pick row at all fall
+ * through.  The correct filter is the OR form below.
+ */
+export async function selectUnpickedAttendees(
+  prisma: PrismaClient,
+  event: { id: string; programId: string },
+) {
+  return prisma.attendingMember.findMany({
+    where: {
+      confirmation: {
+        project: { programId: event.programId },
+        status: 'CONFIRMED',
+      },
+      OR: [
+        { lunchPick: { is: null } },
+        { lunchPick: { is: { pickedAt: null } } },
+      ],
+    },
+    include: { user: { select: { name: true, email: true } } },
+  })
+}