refactor: Migrate DungeonEditor to V2 and update related components

- Replaced the deprecated DungeonEditor with DungeonEditorV2, implementing a card-based architecture for improved UI management.
- Updated CMakeLists.txt to reflect changes in source file organization, including renaming dungeon_editor files to their V2 counterparts.
- Refactored DungeonCanvasViewer to support per-room layer visibility settings and updated related methods for rendering and layer management.
- Enhanced testing framework to accommodate the new DungeonEditorV2 structure, including updates to smoke tests and integration tests.
- Removed legacy dungeon_editor files to streamline the codebase and prevent confusion with the new implementation.

src/app/editor/dungeon/dungeon_editor_v2.cc

@@ -24,7 +24,8 @@ void DungeonEditorV2::Initialize(gfx::IRenderer* renderer, Rom* rom) {
   
   // Setup docking class for room windows
   room_window_class_.ClassId = ImGui::GetID("DungeonRoomClass");
-  room_window_class_.DockingAllowUnclassed = false;  // Room windows dock together
+  room_window_class_.DockingAllowUnclassed = true;  // Room windows can dock with anything
+  room_window_class_.DockingAlwaysTabBar = true;    // Always show tabs when multiple rooms
   
   // Register all cards with the card manager (done once during initialization)
   auto& card_manager = gui::EditorCardManager::Get();