Add layout management with Zustand and integrate LayoutImage component

app/src/store/builder/uselayoutStore.ts

@@ -0,0 +1,37 @@
+import { create } from 'zustand';
+
+type Layout = null | 'layout1' | 'layout2';
+
+type LayoutState = {
+    currentLayout: Layout;
+    setLayout: (layout: Layout) => void;
+    resetLayout: () => void;
+};
+
+const LAYOUT_STORAGE_KEY = 'currentLayout';
+
+const useLayoutStore = create<LayoutState>((set) => ({
+    currentLayout: (() => {
+        if (typeof window !== 'undefined') {
+            const storedLayout = localStorage.getItem(LAYOUT_STORAGE_KEY);
+            return storedLayout ? (JSON.parse(storedLayout) as Layout) : null;
+        }
+        return null;
+    })(),
+    
+    setLayout: (layout) => {
+        if (typeof window !== 'undefined') {
+            localStorage.setItem(LAYOUT_STORAGE_KEY, JSON.stringify(layout));
+        }
+        set({ currentLayout: layout });
+    },
+    
+    resetLayout: () => {
+        if (typeof window !== 'undefined') {
+            localStorage.removeItem(LAYOUT_STORAGE_KEY);
+        }
+        set({ currentLayout: null });
+    },
+}));
+
+export default useLayoutStore;