chore: update to ai sdk v5 beta (#1074)

app/(chat)/api/chat/schema.ts

@@ -1,27 +1,25 @@
 import { z } from 'zod';
 
 const textPartSchema = z.object({
-  text: z.string().min(1).max(2000),
   type: z.enum(['text']),
+  text: z.string().min(1).max(2000),
 });
 
+const filePartSchema = z.object({
+  type: z.enum(['file']),
+  mediaType: z.enum(['image/jpeg', 'image/png']),
+  name: z.string().min(1).max(100),
+  url: z.string().url(),
+});
+
+const partSchema = z.union([textPartSchema, filePartSchema]);
+
 export const postRequestBodySchema = z.object({
   id: z.string().uuid(),
   message: z.object({
     id: z.string().uuid(),
-    createdAt: z.coerce.date(),
     role: z.enum(['user']),
-    content: z.string().min(1).max(2000),
-    parts: z.array(textPartSchema),
-    experimental_attachments: z
-      .array(
-        z.object({
-          url: z.string().url(),
-          name: z.string().min(1).max(2000),
-          contentType: z.enum(['image/png', 'image/jpg', 'image/jpeg']),
-        }),
-      )
-      .optional(),
+    parts: z.array(partSchema),
   }),
   selectedChatModel: z.enum(['chat-model', 'chat-model-reasoning']),
   selectedVisibilityType: z.enum(['public', 'private']),