Fix TipTap word count extension state sharing between multiple editors (#19943)

* Initial plan

* Fix TipTap word count extension state sharing by using configure()

Co-authored-by: iOvergaard <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: iOvergaard <[email protected]>

Author: Copilot

src/Umbraco.Web.UI.Client/src/packages/tiptap/extensions/core/word-count.tiptap-api.ts

@@ -3,7 +3,7 @@ import { css } from '@umbraco-cms/backoffice/external/lit';
 import { CharacterCount } from '@umbraco-cms/backoffice/external/tiptap';
 
 export default class UmbTiptapWordCountExtensionApi extends UmbTiptapExtensionApiBase {
-	getTiptapExtensions = () => [CharacterCount];
+	getTiptapExtensions = () => [CharacterCount.configure()];
 
 	override getStyles = () => css``;
 }