HtmlRenderer: submit type for create and edit action buttons (#41)

The action buttons rendered by HtmlRenderer only set type=submit for
'save'; 'create' and 'edit' fell through to type=button, so their forms
never posted (e.g. the DataView 'Add New' create form was a dead button).
route_plural already handles their POST submissions. Delete is left as a
button since this renderer adds no confirm handler.

Co-authored-by: Titus TC <titus@teamtangible.com>

Author: titus-toia

src/Renderer/HtmlRenderer.php

@@ -189,7 +189,7 @@ protected function render_sidebar( array $sidebar ): string {
      * @return string The rendered HTML.
      */
     protected function render_action( string $action ): string {
-        $type = ( $action === 'save' ) ? 'submit' : 'button';
+        $type = in_array( $action, [ 'save', 'create', 'edit' ], true ) ? 'submit' : 'button';
         $label = ucfirst( $action );
 
         return '<button type="' . $type . '" name="action" value="' . $this->escape( $action ) . '">' . $this->escape( $label ) . '</button>';