some cleanup and start movinig to multiple instances

dicom-viewer/src/App.tsx

@@ -65,8 +65,6 @@ const { MouseBindings, KeyboardBindings } = csToolsEnums;
 
 const { IMAGE_RENDERED } = Enums.Events;
 
-const STACK_TOOL_GROUP_ID = 'STACK_TOOL_GROUP_ID';
-const VOLUME_TOOL_GROUP_ID = 'VOLUME_TOOL_GROUP_ID';
 const MAIN_TOOL_GROUP_ID = 'MAIN_TOOL_GROUP_ID';
 
 // Common CT presets (add more as needed)
@@ -121,7 +119,6 @@ const ALL_MOUSE_BINDINGS = [
 // App definintion
 function App() {
   const elementRef = useRef<HTMLDivElement>(null)
-  const viewportRef = useRef<any>(null) // Store the viewport instance
   const running = useRef(false)
 
   // State to control preset menu open/close
@@ -131,13 +128,6 @@ function App() {
 
   const [fullscreenHoverIdx, setFullscreenHoverIdx] = useState<number | null>(null);
   const [openDropdownIdx, setOpenDropdownIdx] = useState<number | null>(null);
-  // State for overlay info
-  const [imageInfo, setImageInfo] = useState({
-    index: 0,
-    total: 0,
-    windowCenter: "",
-    windowWidth: "",
-  })
 
   const MAX_VIEWPORTS = 9;
   const renderingEngineId = "mainRenderingEngine";