fix: focus editor before inserting

Fixes a small issue where you could try to insert a variable, but nothing happened because the editor was not focused :).

libs/shared/lib/components/textEditor/plugins/InsertVariablesPlugin.tsx

@@ -12,6 +12,9 @@ export const InsertVariablesPlugin = () => {
 
   const onChange = (value: string | number, type: VariableType) => {
     editor.update(() => {
+      const editorElement = document.querySelector('.editor > div') as HTMLDivElement;
+      editorElement?.focus();
+
       const selection = $getSelection() as BaseSelection;
 
       const node = new VariableNode(String(value), type);