fix(HNT-1379): fix saving prospects with datePublished value

- ensures datePublished value is converted to YYYY-MM-DD value prior to
form submission (required by graph input)

Author: jpetto

src/curated-corpus/components/ApprovedItemForm/ApprovedItemForm.test.tsx

@@ -95,6 +95,7 @@ describe('The ApprovedItemForm component', () => {
         { name: 'Two Authors', sortOrder: 2 },
       ],
       publisher: 'Amazing Inventions',
+      datePublished: '2025-12-11 09:30:00',
       topic: Topics.HealthFitness,
       source: CorpusItemSource.Prospect,
       status: CuratedStatus.Recommendation,
@@ -196,6 +197,16 @@ describe('The ApprovedItemForm component', () => {
     const syndicated = screen.getByLabelText(/Syndicated/);
     expect(syndicated).toBeInTheDocument();
     expect(syndicated).toHaveProperty('checked', item.isSyndicated);
+
+    // hidden fields
+    const datePublished = screen.getByLabelText(/datePublished/);
+    expect(datePublished).toBeInTheDocument();
+    // make sure the date time value is converted to just a date
+    expect(datePublished).toHaveValue('2025-12-11');
+
+    const source = screen.getByLabelText(/source/);
+    expect(source).toBeInTheDocument();
+    expect(source).toHaveValue(item.source);
   });
 
   it('should render the ImageUpload component', () => {

src/curated-corpus/components/ApprovedItemForm/ApprovedItemForm.tsx

@@ -1,4 +1,5 @@
 import React, { useEffect, useMemo, useState } from 'react';
+import { DateTime } from 'luxon';
 import {
   Box,
   CircularProgress,
@@ -103,7 +104,11 @@ export const ApprovedItemForm: React.FC<
       publisher: approvedItem.publisher,
       // A read-only value we may get back from the Pocket Graph
       // for some stories + all collections and syndicated items.
-      datePublished: approvedItem.datePublished ?? null,
+      datePublished: approvedItem.datePublished
+        ? DateTime.fromJSDate(new Date(approvedItem.datePublished)).toFormat(
+            'yyyy-MM-dd',
+          )
+        : null,
       language: approvedItem.language ?? '',
       topic: approvedItem.topic ?? '',
       curationStatus: isRecommendation
@@ -550,13 +555,11 @@ export const ApprovedItemForm: React.FC<
       </Grid>
       <Box display="none">
         <TextField
-          type="hidden"
           id="source"
           label="source"
           {...formik.getFieldProps('source')}
         />
         <TextField
-          type="hidden"
           id="datePublished"
           label="datePublished"
           {...formik.getFieldProps('datePublished')}