HtmlRenderer: submit type for create and edit action buttons

[titus-toia]

Bug

HtmlRenderer::render_action() sets type="submit" only for the save action; create and edit fall through to type="button". A type=button button submits nothing, so any form rendered by HtmlRenderer whose action is create/edit is a dead button — clicking it does nothing (no POST, no navigation, no network request).

Concretely: the DataView "Add New" create form can't create anything — Create is a dead button. (The TangibleFieldsRenderer already maps create/save to submit; only HtmlRenderer was missing it.)

Fix

- $type = ( $action === 'save' ) ? 'submit' : 'button';
+ $type = in_array( $action, [ 'save', 'create', 'edit' ], true ) ? 'submit' : 'button';

route_plural() already handles the create/edit POST submissions, so this just lets the buttons actually post. Purely additive: save unchanged, custom JS actions stay button.

delete is intentionally left as button — this renderer adds no confirm onclick, so making it a bare submit would be a no-confirm delete. Deletion is handled via list-view links.