feat(widgets): rebuild admin widgets page to match reference theme

- Replace transfer modal/admin-post flow with reference-style AJAX
  export/import/template dialogs (admin-transfer.js, TransferController)
- Customizer "移出模块" action, reference lazy form loading with t-notice
- Common fields use reference labels, dependencies, compact/inline rows,
  top/bottom-only extra spacing; form header with description/reminder
- Remove placement hint, template preview and legacy transfer code
- Fix widget audit (current_datetime stub, honor catalog common flags)
  and regenerate stale golden fixtures for posts_toc, quote, posts

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/widget-system/widget-admin-lifecycle.test.cjs

@@ -6,7 +6,8 @@ const path = require('node:path')
 const root = path.resolve(__dirname, '../..')
 const core = require(path.join(root, 'assets/widgets/admin-core.js'))
 const admin = fs.readFileSync(path.join(root, 'assets/widgets/admin.js'), 'utf8')
-const controller = fs.readFileSync(path.join(root, 'src/WidgetSystem/AdminFormController.php'), 'utf8')
+const wie = fs.readFileSync(path.join(root, 'assets/widgets/admin-transfer.js'), 'utf8')
+const controller =fs.readFileSync(path.join(root, 'src/WidgetSystem/AdminFormController.php'), 'utf8')
 const transfer = fs.readFileSync(path.join(root, 'src/WidgetSystem/TransferController.php'), 'utf8')
 const renderer = fs.readFileSync(path.join(root, 'src/WidgetSystem/FormRenderer.php'), 'utf8')
 const styles = fs.readFileSync(path.join(root, 'assets/widgets/admin.css'), 'utf8')
@@ -25,17 +26,22 @@ test('lazy form AJAX failures remain retryable and instance filters match WordPr
   assert.match(controller, /apply_filters\('widget_form_callback', \$instance, \$widget\)/)
 })
 
-test('sidebar toolbars open one contextual import, export, or template dialog', () => {
-  assert.match(admin, /widgets-holder-wrap:not\(#available-widgets\)/)
-  assert.match(admin, /control-section-sidebar/)
-  assert.match(admin, /data-aksrt-transfer-action/)
-  assert.match(admin, /data-sidebar-id/)
-  assert.match(admin, /data-transfer-tab/)
-  assert.match(transfer, /aksrt-widget-transfer-modal__dialog/)
-  assert.match(transfer, /aksrt_widgets_template_preview/)
-  assert.doesNotMatch(transfer, /aksrt-widget-transfer__grid/)
-  assert.doesNotMatch(transfer, /function sidebar_select/)
-  assert.match(admin, /aksrt-widget-customizer-remove/)
+test('sidebar toolbars drive reference-style AJAX export, import and template modals', () => {
+  assert.match(wie, /widgets-holder-wrap:not\(#available-widgets\)/)
+  assert.match(wie, /control-section-sidebar/)
+  assert.match(wie, /data-aksrt-wie-action/)
+  assert.match(wie, /data-sidebar-id/)
+  assert.match(wie, /aksrt-wie-btn-delete/)
+  assert.match(wie, /nonce: config\.transferNonce/)
+  for (const action of ['export_sidebar', 'import_sidebar', 'list_templates', 'import_template']) {
+    assert.match(wie, new RegExp(`aksrt_widgets_${action}`))
+    assert.match(transfer, new RegExp(`wp_ajax_aksrt_widgets_${action}`))
+  }
+  assert.match(transfer, /check_ajax_referer\(self::NONCE, 'nonce'\)/)
+  assert.match(transfer, /edit_theme_options/)
+  assert.doesNotMatch(transfer, /aksrt_widgets_template_preview|admin_post_|admin_notices/)
+  assert.doesNotMatch(admin, /data-aksrt-transfer-action|aksrt-widget-customizer-remove|aksrt-widget-form-lazy__load/)
+  assert.match(styles, /\.aksrt-wie-modal__dialog/)
 })
 
 test('widget fields follow the current CSF compact palette and cloneable group patterns', () => {
@@ -46,7 +52,9 @@ test('widget fields follow the current CSF compact palette and cloneable group p
   assert.match(styles, /\.aksrt-widget-choices--palette/)
   assert.match(styles, /\.aksrt-widget-repeater__bar/)
   assert.match(styles, /\.customize-control-widget_form \.aksrt-widget-field__label/)
-  assert.match(admin, /if \(!response\?\.success \|\| !response\.data\) \{/)
+  assert.match(admin, /if \(!response\?\.success \|\| !response\.data\?\.html\) \{/)
+  assert.match(admin, /t-notice/)
+  assert.match(styles, /\.aksrt-widget-field\.is-compact/)
   assert.match(admin, /responseJSON\?\.data\?\.message/)
   assert.doesNotMatch(admin, /if \(!response\?\.success\) throw new Error/)
 })