feat(creator-studio): centered paper layout and scheduled publishing

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/widget-system/creator-studio-contract.test.cjs

@@ -197,8 +197,44 @@ test('TinyMCE media buttons reuse Jio uploads and preserve bookmarks', () => {
 	assert.match(appSource, /data-video-url/);
 	assert.match(read('src/Core/CreatorStudio.php'), /front-submit\/upload\/image/);
 	assert.match(read('assets/css/frontend/pages/submit.css'), /\.jio-editor-media\s*\{/);
-	assert.match(read('assets/creator-studio/src/components/cover-strip.tsx'), /添加封面/);
-	assert.match(appSource, /<CoverStrip/);
+	assert.match(read('assets/creator-studio/src/components/publish-settings.tsx'), /添加封面/);
+	assert.match(appSource, /<PublishSettings/);
+});
+
+test('writing surface is a centered paper card with a publish settings card below', () => {
+	const styles = read('assets/creator-studio/src/styles/studio.scss');
+	const settings = read('assets/creator-studio/src/components/publish-settings.tsx');
+
+	assert.doesNotMatch(appSource, /jio-creator__excerpt/);
+	assert.match(appSource, /请输入标题（最多 %d 个字）/, 'title placeholder must state the character limit');
+	assert.match(appSource, /className="jio-creator__title"/);
+	assert.match(appSource, /<PublishSettings/);
+
+	assert.match(styles, /\.jio-creator__canvas\s*\{[^}]*background:\s*#fff/);
+	assert.match(styles, /\.jio-creator__canvas\s*\{[^}]*width:\s*min\(900px/);
+	assert.match(styles, /\.jio-creator__canvas\s*\{[^}]*margin:\s*40px auto 0/);
+	assert.match(styles, /\.jio-page-submit\s*\{[^}]*background:\s*#f6f6f6/);
+	assert.match(styles, /\.jio-creator__settings\s*\{[^}]*background:\s*#fff/);
+	assert.match(styles, /\.jio-creator__title\s*\{[\s\S]*?font-size:\s*clamp\(26px, 3vw, 32px\)/);
+	assert.match(styles, /\.jio-creator__title\s*\{[\s\S]*?border-bottom:\s*1px solid/);
+
+	assert.match(settings, /定时发布/);
+	assert.match(settings, /type="datetime-local"/);
+	assert.match(settings, /canSchedule/);
+	assert.match(appSource, /scheduleEnabled=\{!!draft\.schedule\.enabled\}/);
+});
+
+test('scheduled publishing is validated and applied server side', () => {
+	const save = read('src/Core/FrontSubmitSave.php');
+	const rest = read('src/Core/CreatorRest.php');
+
+	assert.match(save, /private function normalize_schedule\(array \$data\): string/);
+	assert.match(save, /\$status\s*=\s*'future';/);
+	assert.match(save, /\$postarr\['post_date'\]\s*=\s*\$schedule_at;/);
+	assert.match(save, /get_gmt_from_date\(\$schedule_at\)/);
+	assert.match(save, /case 'future':/);
+	assert.match(rest, /'schedule'\s*=>\s*\(array\) \$request->get_param\('schedule'\)/);
+	assert.match(rest, /'canSchedule'\s*=>\s*\$cap\('new_post_audit_no'\)/);
 });
 
 test('Chinese character count strips markup and counts visible text', () => {