Lexical: Updated toolbar & text node exporting

- Updated toolbar to match existing editor, including dynamic RTL/LTR
  controls.
- Updated text node handling to not include spans and extra classes when
  not needed. Added & update tests to cover.

resources/js/wysiwyg/lexical/headless/__tests__/unit/LexicalHeadlessEditor.test.ts

@@ -206,7 +206,7 @@ describe('LexicalHeadlessEditor', () => {
     cleanup();
 
     expect(html).toBe(
-      '<p dir="ltr"><span style="white-space: pre-wrap;">hello world</span></p>',
+      '<p>hello world</p>',
     );
   });
 });