add editor

src/uhm/lib/editor/session/useBackgroundSessionState.ts

@@ -0,0 +1,21 @@
+import { useState } from "react";
+import {
+    BackgroundLayerVisibility,
+    HIDDEN_BACKGROUND_LAYER_VISIBILITY,
+} from "@/uhm/lib/backgroundLayers";
+
+export function useBackgroundSessionState() {
+    // Trạng thái bật/tắt layer nền (khởi tạo default hidden; sẽ load từ storage ở page).
+    const [backgroundVisibility, setBackgroundVisibility] = useState<BackgroundLayerVisibility>(
+        () => ({ ...HIDDEN_BACKGROUND_LAYER_VISIBILITY })
+    );
+    // Đảm bảo đã load visibility trước khi render map thật.
+    const [isBackgroundVisibilityReady, setIsBackgroundVisibilityReady] = useState(false);
+
+    return {
+        backgroundVisibility,
+        setBackgroundVisibility,
+        isBackgroundVisibilityReady,
+        setIsBackgroundVisibilityReady,
+    };
+}