Made fixes to the bugs.

frontend/apps/editor3d/app/src/pages/PageDraw/Mirai.tsx

@@ -158,7 +158,7 @@ export const Mirai = ({
           strokeWidth: brushSize / stage.scaleX(),
           draggable: true,
         };
-        
+        store.selectNode(null);
         store.addLineNode(newLineNode);
         setCurrentLineId(lineId);
         setIsDrawing(true);
@@ -386,13 +386,11 @@ export const Mirai = ({
     const handleNodeMouseLeave = (e: Konva.KonvaEventObject<MouseEvent>) => {
       const container = e.target.getStage()?.container();
       if (!container) return;
-      const defaultCursor = activeTool === 'draw' 
-        ? 'crosshair' 
-        : activeTool === 'eraser'
-          ? 'cell'
-          : activeTool === 'select'
-            ? 'grab'
-            : 'default';
+      const defaultCursor = activeTool === 'draw' || activeTool === 'eraser'
+        ? 'none'
+        : activeTool === 'select'
+          ? 'grab'
+          : 'default';
       container.style.cursor = defaultCursor;
     };
 
@@ -467,17 +465,21 @@ export const Mirai = ({
     const renderNode = (node: Node | LineNode) => {
         // Node Callbacks
         const handleNodeMouseDown = (e: Konva.KonvaEventObject<MouseEvent | TouchEvent>, nodeId: string) => {
+          // Don't select nodes when draw or erase tools are active
+          if (activeTool === 'draw' || activeTool === 'eraser') {
+            return;
+          }
+          
           // Check if Ctrl/Cmd key is pressed
           const isMultiSelect = e.evt.ctrlKey || e.evt.metaKey;
           
           // If clicking directly on the stage, clear selection
           if (e.target === e.target.getStage()) {
-
             store.selectNode(null);
             return;
           }
 
-          store.selectNode(nodeId,isMultiSelect);
+          store.selectNode(nodeId, isMultiSelect);
         };
 
         const handleNodeDragStart = (e: Konva.KonvaEventObject<DragEvent>, nodeId:string) => {

frontend/apps/editor3d/app/src/pages/PageDraw/SceneState.ts

@@ -239,6 +239,7 @@ export const useSceneStore = create<SceneState>((set, get) => ({
       draggable: true
     });
     get().addNode(node);
+    get().setActiveTool('select'); // Switch to select tool after creating
   },
   
   createCircle: (x: number, y: number, radius = 50, fill = '#f0f0f0') => {
@@ -255,6 +256,7 @@ export const useSceneStore = create<SceneState>((set, get) => ({
       draggable: true
     });
     get().addNode(node);
+    get().setActiveTool('select'); // Switch to select tool after creating
   },
   
   createTriangle: (x: number, y: number, width = 100, height = 100, fill = '#d0d0d0') => {
@@ -271,6 +273,7 @@ export const useSceneStore = create<SceneState>((set, get) => ({
       draggable: true
     });
     get().addNode(node);
+    get().setActiveTool('select'); // Switch to select tool after creating
   },
   
   // History management

frontend/apps/editor3d/app/src/pages/PageDraw/SideToolbar.tsx

@@ -62,11 +62,11 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
   onGenerateImage,
   onUploadImage,
   onDelete,
+  activeToolId,
   className = "",
 }) => {
   /* ------------------------------------------------ state ---------- */
   const [open, setOpen]       = useState<string | null>(null);
-  const [selected, setSel]    = useState<string>("select");
 
   const [brushSize, setBrushSize] = useState(16);
   const [brushHsva, setBrushHsva] = useState<HsvaColor>({ h:120,s:100,v:100,a:1 });
@@ -310,7 +310,7 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
           }
 
           const { id, icon, onClick, popout, label } = tool;
-          const active = id === selected;
+          const active = id === activeToolId;
           const btnStyle = active ? "bg-zinc-600 text-white" : "hover:bg-zinc-800 text-zinc-100";
 
           return (
@@ -321,7 +321,6 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
                     <button
                       onClick={() => {
                         onClick?.();
-                        setSel(id);
                         setOpen(open === id ? null : id);
                       }}
                       className={`${baseBtn} ${btnStyle}`}
@@ -332,7 +331,6 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
                     <button
                       onClick={() => {
                         onClick?.();
-                        setSel(id);
                       }}
                       className={`${baseBtn} ${btnStyle}`}
                     >