feat: automatic addition of goals to a current goal node, adding it to the plan, making sure the data stays correct. Also for the trigger nodes. :)

ref: N25B-434

src/pages/VisProgPage/visualProgrammingUI/components/Plan.default.ts

@@ -1,7 +1,7 @@
-import type { Plan } from "./Plan";
+import type { Plan, PlanElement } from "./Plan";
 
 export const defaultPlan: Plan = {
     name: "Default Plan",
     id: "-1",
-    steps: [],
+    steps: [] as PlanElement[],
 }