feat(core): Update LLM applications building support (no-changelog) (#7710)

extracted out of #7336

---------

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Alex Grozav <alex@grozav.com>

packages/editor-ui/src/plugins/jsplumb/N8nAddInputEndpointRenderer.ts

@@ -16,7 +16,7 @@ export const register = () => {
 			const sizeDifference = (unconnectedPlusSize - unconnectedDiamondWidth) / 2;
 
 			const container = svg.node('g', {
-				style: `--svg-color: var(${endpointInstance.params.color})`,
+				style: `--svg-color: var(--endpoint-svg-color, var(${endpointInstance.params.color}))`,
 				width,
 				height,
 			});

packages/editor-ui/src/plugins/jsplumb/N8nAddInputEndpointType.ts

@@ -46,6 +46,14 @@ export class N8nAddInputEndpoint extends EndpointRepresentation<ComputedN8nAddIn
 		this.instance.unbind(EVENT_ENDPOINT_CLICK, this.fireClickEvent);
 	}
 
+	setError() {
+		this.endpoint.addClass('add-input-endpoint-error');
+	}
+
+	resetError() {
+		this.endpoint.removeClass('add-input-endpoint-error');
+	}
+
 	fireClickEvent = (endpoint: Endpoint) => {
 		if (endpoint === this.endpoint) {
 			this.instance.fire(EVENT_ADD_INPUT_ENDPOINT_CLICK, this.endpoint);