There's an error with the widget; previews aren't showing.

The widget isn't working in Drupal 11—the image preview isn't showing. Here's the working code for FileEditableWidget. Check it out, maybe modify it, and include it in the module. Without this, the module is useless.

<?php

namespace Drupal\file_entity\Plugin\Field\FieldWidget;

use Drupal\Core\Field\Attribute\FieldWidget;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\image\Plugin\Field\FieldWidget\ImageWidget;

/**
 * File widget with support for editing the referenced file inline.
 */
#[FieldWidget(
  id: "file_editable",
  label: new TranslatableMarkup("Editable file"),
  field_types: ["image"],
)]
class FileEditableWidget extends ImageWidget {

  /**
   * {@inheritdoc}
   */
  public static function process($element, FormStateInterface $form_state, $form) {
    // Get full ImageWidget processing (preview, alt, title)
    $element = parent::process($element, $form_state, $form);

    // If no files - return element as is
    if (empty($element['#files'])) {
      return $element;
    }

    // Add Edit button for each file
    foreach ($element['#files'] as $fid => $file) {
      // Ensure $file is a FileInterface object
      if (!is_object($file) || !method_exists($file, 'access')) {
        continue;
      }

      // Create unique button key
      $button_key = 'edit_button_' . $fid;
      
      $element[$button_key] = [
        '#type' => 'submit',
        '#value' => t('Edit'),
        '#name' => 'file_editable_' . $fid,
        '#ajax' => [
          'url' => Url::fromRoute('entity.file.inline_edit_form', ['file' => $fid]),
        ],
        '#access' => $file->access('update'),
        '#weight' => 20, // Place after preview (weight: -10) and alt/title fields
        '#submit' => ['file_managed_file_submit'],
        // Ensure button doesn't trigger full form validation
        '#limit_validation_errors' => [],
        '#validate' => [],
      ];
    }

    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $element = parent::settingsForm($form, $form_state);
    
    // Additional Editable widget specific settings can be added here if needed
    
    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = parent::settingsSummary();
    
    // Add information about this being an editable widget
    $summary[] = $this->t('Includes inline file editing');
    
    return $summary;
  }

}