feat: create tests, more integration testing, fix ID tests, use UUID (almost) everywhere

ref: N25B-412

test/setupFlowTests.ts

@@ -61,6 +61,7 @@ export const mockReactFlow = () => {
     width: 200,
     height: 200,
   });
+
 };
 
 
@@ -88,3 +89,16 @@ afterEach(() => {
   });
 });
 
+if (typeof HTMLDialogElement !== 'undefined') {
+  if (!HTMLDialogElement.prototype.showModal) {
+    HTMLDialogElement.prototype.showModal = function () {
+      // basic behavior: mark as open
+      this.setAttribute('open', '');
+    };
+  }
+  if (!HTMLDialogElement.prototype.close) {
+    HTMLDialogElement.prototype.close = function () {
+      this.removeAttribute('open');
+    };
+  }
+}