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

editor/app/Windowing/System/EditorWindowSystem.cpp

@@ -0,0 +1,78 @@
+#include "Windowing/System/EditorWindowSystem.h"
+
+#include <utility>
+
+namespace XCEngine::UI::Editor::App {
+
+EditorWindowSystem::EditorWindowSystem(UIEditorPanelRegistry panelRegistry)
+    : m_workspaceStore(std::move(panelRegistry)) {}
+
+const UIEditorPanelRegistry& EditorWindowSystem::GetPanelRegistry() const {
+    return m_workspaceStore.GetPanelRegistry();
+}
+
+bool EditorWindowSystem::BootstrapPrimaryWindow(
+    std::string_view primaryWindowId,
+    const UIEditorWorkspaceController& workspaceController,
+    std::string& outError) {
+    const std::string resolvedPrimaryWindowId =
+        primaryWindowId.empty() ? std::string("main-window") : std::string(primaryWindowId);
+
+    UIEditorWindowWorkspaceSet windowSet = {};
+    windowSet.primaryWindowId = resolvedPrimaryWindowId;
+    windowSet.activeWindowId = resolvedPrimaryWindowId;
+
+    UIEditorWindowWorkspaceState primaryWindowState = {};
+    primaryWindowState.windowId = resolvedPrimaryWindowId;
+    primaryWindowState.workspace = workspaceController.GetWorkspace();
+    primaryWindowState.session = workspaceController.GetSession();
+    windowSet.windows.push_back(std::move(primaryWindowState));
+
+    return m_workspaceStore.TrySetWindowSet(std::move(windowSet), outError);
+}
+
+bool EditorWindowSystem::ValidateWindowSet(
+    const UIEditorWindowWorkspaceSet& windowSet,
+    std::string& outError) const {
+    return m_workspaceStore.ValidateWindowSet(windowSet, outError);
+}
+
+bool EditorWindowSystem::TrySetWindowSet(
+    UIEditorWindowWorkspaceSet windowSet,
+    std::string& outError) {
+    return m_workspaceStore.TrySetWindowSet(std::move(windowSet), outError);
+}
+
+bool EditorWindowSystem::UpsertWindowState(
+    const UIEditorWindowWorkspaceState& windowState,
+    bool primary,
+    std::string& outError) {
+    return m_workspaceStore.UpsertWindowState(windowState, primary, outError);
+}
+
+void EditorWindowSystem::RemoveWindowState(std::string_view windowId, bool primary) {
+    m_workspaceStore.RemoveWindowState(windowId, primary);
+}
+
+bool EditorWindowSystem::IsPrimaryWindowId(std::string_view windowId) const {
+    return m_workspaceStore.IsPrimaryWindowId(windowId);
+}
+
+const UIEditorWindowWorkspaceSet& EditorWindowSystem::GetWindowSet() const {
+    return m_workspaceStore.GetWindowSet();
+}
+
+UIEditorWindowWorkspaceController EditorWindowSystem::BuildWorkspaceMutationController() const {
+    return UIEditorWindowWorkspaceController(GetPanelRegistry(), GetWindowSet());
+}
+
+UIEditorWindowWorkspaceOperationResult EditorWindowSystem::EvaluateDetachPanelToNewWindow(
+    std::string_view sourceWindowId,
+    std::string_view sourceNodeId,
+    std::string_view panelId,
+    UIEditorWindowWorkspaceController& outController) const {
+    outController = BuildWorkspaceMutationController();
+    return outController.DetachPanelToNewWindow(sourceWindowId, sourceNodeId, panelId);
+}
+
+} // namespace XCEngine::UI::Editor::App