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/components/admin/logistics/lunch-tab.tsx

@@ -32,6 +32,7 @@ export function LunchTab({ programId }: { programId: string }) {
           />
           <LunchRecapActions
             programId={programId}
+            lunchEventId={event.id}
             recapSentAt={event.recapSentAt}
             extraRecipientCount={event.extraRecipients.length}
           />