Fix global swap configuration conflict with local text content swap

## Why

Hello. :wave: I've run into a situation where setting default behavior for htmx causes a weird edge case when using the SSE extension in regards to swapping of content.

## How

To recreate, add a global htmx configuration as follows:

``` html

```

Then you can render a template with the following setup:

``` html

<%= image_tag "loader.svg", alt: "Loader", width: 800, height: 480 %>

<%= render :welcome %>

```

The critical piece is the use of `hx-swap="textContent"` in the text area. Use of `textContent` for swapping purposes completely fails when the global htmx configuration uses `outerHTML` as the default swap behavior. If you remove the global configuration, everything works properly. For some reason, the SSS extension appears to not honor the `textContent` swap style when the global configuration is in play.

Reproduce the issue using the htmx-config with defaultSwapStyle set to outerHTML, the SSE extension example, and hx-swap="textContent" on the textarea. Inspect the SSE extension's swap handling and verify that local textContent behavior is preserved despite the global configuration.

Written by the indexing model from the issue text.