refactor: reorganize project structure by migrating engine and geometry utilities into a structured map directory

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

@@ -1,4 +1,4 @@
-import type { EntityGeometryPreset } from "@/uhm/lib/entityTypeOptions";
+import type { EntityGeometryPreset } from "@/uhm/lib/utils/entityTypeOptions";
 
 export type EditorMode =
     | "idle"

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

@@ -2,7 +2,7 @@ import { useState } from "react";
 import {
     BackgroundLayerVisibility,
     HIDDEN_BACKGROUND_LAYER_VISIBILITY,
-} from "@/uhm/lib/backgroundLayers";
+} from "@/uhm/lib/map/styles/backgroundLayers";
 
 export function useBackgroundSessionState() {
     // Trạng thái bật/tắt layer nền (khởi tạo default hidden; sẽ load từ storage ở page).

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

@@ -1,6 +1,6 @@
 import { useState } from "react";
 import type { TimelineRange } from "@/uhm/lib/editor/session/sessionTypes";
-import { clampYearValue } from "@/uhm/lib/timeline";
+import { clampYearValue } from "@/uhm/lib/utils/timeline";
 
 type Options = {
     currentYear: number;