* feat: Add SimpleCombobox component
* feat: Add labelClassName and add manual focus handling
* feat: Update VariableForm component to use SimpleCombobox
The VariableForm component in the client/src/components/Prompts/Groups/VariableForm.tsx file has been updated to use the SimpleCombobox component instead of the InputWithDropdown component. This change improves the functionality and styling of the form.
* chore: Update VariableForm component placeholder text
* refactor: Improve VariableForm component
The VariableForm component in the client/src/components/Prompts/Groups/VariableForm.tsx file has been refactored to improve its functionality. The `parseFieldConfig` function now trims the `variable` string before processing it. Additionally, the `onSubmit` function now properly escapes potential regex special chars that may cause issues when replacing text
* refactor: Improve VariableForm using ariakit helpers/custom fields, open menu on input focus
* refactor: rename SimpleCombobox to InputCombobox
