feat(prompt-input): add file property to attachment messages for persistent storage

Author: chaxus

packages/elements/src/prompt-input.tsx

@@ -430,7 +430,7 @@ export const PromptInputActionAddAttachments = ({
 
 export type PromptInputMessage = {
   text: string;
-  files: FileUIPart[];
+  files: (FileUIPart & { file?: File })[];
 };
 
 export type PromptInputProps = Omit<
@@ -731,7 +731,7 @@ export const PromptInput = ({
         return item;
       })
     )
-      .then((convertedFiles: FileUIPart[]) => {
+      .then((convertedFiles: (FileUIPart & { file?: File })[]) => {
         try {
           const result = onSubmit({ text, files: convertedFiles }, event);