Fix loss of tree node state when switching views

This commit fixes an issue where the check state of categories was lost
when toggling between card and tree views. This is solved by immediately
emitting node state changes for all nodes. This ensures consistent view
transitions without any loss of node state information.

Furthermore, this commit includes added unit tests for the modified code
sections.

tests/unit/shared/Stubs/NodeStateChangeEventArgsStub.ts

@@ -0,0 +1,48 @@
+import { NodeStateChangeEventArgs } from '@/presentation/components/Scripts/View/Tree/TreeView/UseNodeStateChangeAggregator';
+import { TreeNode } from '@/presentation/components/Scripts/View/Tree/TreeView/Node/TreeNode';
+import { TreeNodeStateDescriptor } from '@/presentation/components/Scripts/View/Tree/TreeView/Node/State/StateDescriptor';
+import { TreeNodeStub } from './TreeNodeStub';
+import { TreeNodeStateDescriptorStub } from './TreeNodeStateDescriptorStub';
+import { HierarchyAccessStub } from './HierarchyAccessStub';
+
+export class NodeStateChangeEventArgsStub implements NodeStateChangeEventArgs {
+  public node: TreeNode = new TreeNodeStub()
+    .withId(`[${NodeStateChangeEventArgsStub.name}] node-stub`);
+
+  public newState: TreeNodeStateDescriptor = new TreeNodeStateDescriptorStub();
+
+  public oldState?: TreeNodeStateDescriptor = new TreeNodeStateDescriptorStub();
+
+  public withNode(node: TreeNode): this {
+    this.node = node;
+    return this;
+  }
+
+  public withNewState(newState: TreeNodeStateDescriptor): this {
+    this.newState = newState;
+    return this;
+  }
+
+  public withOldState(oldState: TreeNodeStateDescriptor): this {
+    this.oldState = oldState;
+    return this;
+  }
+}
+
+export function createChangeEvent(scenario: {
+  readonly oldState?: TreeNodeStateDescriptor;
+  readonly newState: TreeNodeStateDescriptor;
+  readonly hierarchyBuilder?: (hierarchy: HierarchyAccessStub) => HierarchyAccessStub;
+}) {
+  let nodeHierarchy = new HierarchyAccessStub();
+  if (scenario.hierarchyBuilder) {
+    nodeHierarchy = scenario.hierarchyBuilder(nodeHierarchy);
+  }
+  const changeEvent = new NodeStateChangeEventArgsStub()
+    .withOldState(scenario.oldState)
+    .withNewState(scenario.newState)
+    .withNode(new TreeNodeStub()
+      .withId(`[${createChangeEvent.name}] node-stub`)
+      .withHierarchy(nodeHierarchy));
+  return changeEvent;
+}