Switched to database-based tracking for page editor

- Works better to avoid bad assumptions when showing the editor based
  upon content type.
- Also updated some previous tests to cleaner format.

app/Entities/Models/Page.php

@@ -22,6 +22,7 @@ use Illuminate\Database\Eloquent\Relations\HasOne;
  * @property bool         $template
  * @property bool         $draft
  * @property int          $revision_count
+ * @property string       $editor
  * @property Chapter      $chapter
  * @property Collection   $attachments
  * @property Collection   $revisions

app/Entities/Models/PageRevision.php

@@ -12,6 +12,7 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
  *
  * @property mixed  $id
  * @property int    $page_id
+ * @property string $name
  * @property string $slug
  * @property string $book_slug
  * @property int    $created_by
@@ -21,6 +22,7 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
  * @property string $summary
  * @property string $markdown
  * @property string $html
+ * @property string $text
  * @property int    $revision_number
  * @property Page   $page
  * @property-read ?User $createdBy