Add project overview import

src/shared/validation/project-transfer.schemas.ts

@@ -1,18 +1,30 @@
 import { z } from "zod";
 import { expectedProjectRevisionSchema } from "./project-command.schemas.js";
 
+const requiredProjectTransferSchema = z
+  .unknown()
+  .refine((value) => value !== undefined, {
+    message: "Projektdatei fehlt.",
+  });
+
+export const importProjectTransferAsNewSchema = z
+  .object({
+    transfer: requiredProjectTransferSchema,
+  })
+  .strict();
+
 export const importProjectTransferSchema = z.discriminatedUnion("mode", [
   z
     .object({
       mode: z.literal("replace"),
       expectedRevision: expectedProjectRevisionSchema,
-      transfer: z.unknown(),
+      transfer: requiredProjectTransferSchema,
     })
     .strict(),
   z
     .object({
       mode: z.literal("duplicate"),
-      transfer: z.unknown(),
+      transfer: requiredProjectTransferSchema,
     })
     .strict(),
 ]);