Headings button breaks focus in WYSIWYG editor

### Describe the bug After selecting and deselecting a heading option in the WYSIWYG editor, focus is removed from the text input, meaning typing and keyboard shortcuts no longer work. ### Reproduction 1. Enable the WYSIWYG editor by pressing the `Aa` button in the input box. 2. Write something. 3. Press the headings button and select a heading. 4. Press the headings button again to remove the heading. 5. Observe that typing and keyboard shortcuts no longer work until you click into the input box again. ### Expected behavior Focus would remain in the editor. ### Platform and versions ```shell 1. OS: Windows 10 2. Browser: Helium version 0.9.4.1 3. Cinny version: v1.11.1 PWA ``` ### Additional context _No response_