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/server/routers/lunch.ts

@@ -153,7 +153,7 @@ export const lunchRouter = router({
         roleNote: z.string().max(500).optional(),
         dishId: z.string().nullable().optional(),
         allergens: allergens.optional(),
-        allergenOther: z.string().max(500).optional(),
+        allergenOther: z.string().max(500).nullable().optional(),
       }),
     )
     .mutation(async ({ ctx, input }) => {

src/server/routers/program.ts

@@ -391,4 +391,21 @@ export const programRouter = router({
 
       return { ok: true }
     }),
+
+  /**
+   * List CONFIRMED finalist projects for a program — used by the lunch
+   * externals dialog to attach an external attendee to a team.
+   */
+  listFinalistProjects: adminProcedure
+    .input(z.object({ programId: z.string() }))
+    .query(({ ctx, input }) =>
+      ctx.prisma.project.findMany({
+        where: {
+          programId: input.programId,
+          finalistConfirmation: { status: 'CONFIRMED' },
+        },
+        select: { id: true, title: true },
+        orderBy: { title: 'asc' },
+      }),
+    ),
 })