feat: external lunch attendees card + dialog

Adds program.listFinalistProjects helper. Externals dialog supports
both standalone and project-attached entries; manifest's external row
edit-pencil opens this dialog via forwardRef.

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

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

@@ -1,13 +1,16 @@
 'use client'
 
+import { useRef } from 'react'
 import { trpc } from '@/lib/trpc/client'
 import { Skeleton } from '@/components/ui/skeleton'
 import { LunchEventConfig } from './lunch-event-config'
 import { LunchDishes } from './lunch-dishes'
 import { LunchManifest } from './lunch-manifest'
+import { LunchExternals, type LunchExternalsHandle } from './lunch-externals'
 
 export function LunchTab({ programId }: { programId: string }) {
   const { data: event, isLoading } = trpc.lunch.getEvent.useQuery({ programId })
+  const externalsRef = useRef<LunchExternalsHandle>(null)
   if (isLoading || !event) {
     return <Skeleton className="h-48 w-full" />
   }
@@ -17,8 +20,16 @@ export function LunchTab({ programId }: { programId: string }) {
       {event.enabled && (
         <>
           <LunchDishes programId={programId} lunchEventId={event.id} />
-          <LunchManifest programId={programId} />
-          {/* Externals + recap actions mount in Tasks 17-18. */}
+          <LunchManifest
+            programId={programId}
+            onEditExternal={(id) => externalsRef.current?.openEditDialog(id)}
+          />
+          <LunchExternals
+            ref={externalsRef}
+            programId={programId}
+            lunchEventId={event.id}
+          />
+          {/* Recap actions card mounts in Task 18. */}
         </>
       )}
     </div>