test: added tests for the ProgramStore

also added documentation

ref: N25B-428

src/pages/VisProgPage/VisProg.tsx

@@ -9,6 +9,7 @@ import {
 import '@xyflow/react/dist/style.css';
 import {useEffect} from "react";
 import {useShallow} from 'zustand/react/shallow';
+import useProgramStore from "../../utils/programStore.ts";
 import {DndToolbar} from './visualProgrammingUI/components/DragDropSidebar.tsx';
 import useFlowStore from './visualProgrammingUI/VisProgStores.tsx';
 import type {FlowState} from './visualProgrammingUI/VisProgTypes.tsx';
@@ -152,6 +153,10 @@ function runProgram() {
   ).then((res) => {
     if (!res.ok) throw new Error("Failed communicating with the backend.")
     console.log("Successfully sent the program to the backend.");
+
+    // store reduced program in global program store for further use in the UI
+    // when the program was sent to the backend successfully:
+    useProgramStore.getState().setProgramState(structuredClone(program));
   }).catch(() => console.log("Failed to send program to the backend."));
 }