chore: snapshot editor work and restore tests

Key points:\n- restore the tests tree removed by bc47e6e\n- capture current editor workspace, scene, and docs reshuffle changes\n- keep local cloud.nvdb resources ignored from this commit

tests/RHI/D3D12/unit/test_command_queue.cpp

@@ -0,0 +1,18 @@
+#include "fixtures/D3D12TestFixture.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandQueue.h"
+
+using namespace XCEngine::RHI;
+
+TEST_F(D3D12TestFixture, CommandQueue_Get_TimestampFrequency) {
+    ASSERT_NE(GetCommandQueue(), nullptr);
+    UINT64 frequency = GetCommandQueue()->GetTimestampFrequency();
+    EXPECT_GT(frequency, 0);
+}
+
+TEST_F(D3D12TestFixture, CommandQueue_Execute_EmptyCommandLists) {
+    GetCommandList()->Reset();
+    void* commandLists[] = { GetCommandList() };
+    GetCommandQueue()->ExecuteCommandLists(1, commandLists);
+    GetCommandList()->Close();
+    WaitForGPU();
+}