refactor: bỏ LQIP nhánh chuyển cảnh (không hiển thị), giữ blur-up cảnh đầu

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -41,3 +41,6 @@ yarn-error.log*
 next-env.d.ts
 
 .vercel
+
+# ảnh gốc trước khi nén (backup cục bộ)
+/image-originals

docs/superpowers/plans/2026-06-24-toi-uu-phy-vr360.md

@@ -0,0 +1,761 @@
+# Tối ưu hiệu năng & sửa bản đồ phy-vr360 — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Loại bỏ đơ/giật/lag và làm bản đồ panel "Vị trí" hiển thị cân đối, đầy đủ, không bị khuất.
+
+**Architecture:** Nén ảnh panorama 394MB → ~30MB bằng script `sharp` (backup gốc + sinh ảnh mờ blur-up), sửa `MiniMap` overview sang auto-fit, và tối ưu engine `VirtualTour.tsx` (render theo nhu cầu, bỏ `preserveDrawingBuffer`, hạ pixelRatio, preload lúc rảnh, blur-up khi tải).
+
+**Tech Stack:** Next.js 16 / React 19, three.js 0.184, sharp (đã cài), TypeScript.
+
+**Spec:** `docs/superpowers/specs/2026-06-24-toi-uu-phy-vr360-design.md`
+
+**Lưu ý môi trường:** Shell là Git Bash trên Windows; chạy lệnh trong thư mục `phy-vr360`. Dự án **không có test runner** — kiểm chứng bằng `npx tsc --noEmit`, output của script, `npm run build`, và checklist thủ công. Mỗi commit kết thúc bằng trailer:
+`Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>`
+
+---
+
+## Task 1: Script nén ảnh + .gitignore
+
+**Files:**
+- Create: `scripts/optimize-images.mjs`
+- Modify: `.gitignore`
+
+- [ ] **Step 1: Tạo script nén ảnh**
+
+Create `scripts/optimize-images.mjs`:
+
+```js
+// Nén ảnh panorama + modal, backup bản gốc, sinh ảnh mờ (LQIP).
+// Chạy: node scripts/optimize-images.mjs  (chạy lại nhiều lần an toàn — luôn nén từ backup gốc)
+import sharp from "sharp";
+import { promises as fs } from "node:fs";
+import path from "node:path";
+
+const ROOT = process.cwd();
+const PANO_DIR = path.join(ROOT, "public/images/chua-thai-lac");
+const MODAL_DIR = path.join(ROOT, "public/modal");
+const BACKUP_DIR = path.join(ROOT, "image-originals");
+const LQIP_OUT = path.join(ROOT, "src/app/tours/chua-thai-lac.lqip.ts");
+
+const PANO_WIDTH = 6144;
+const PANO_QUALITY = 80;
+const LQIP_WIDTH = 32;
+const MODAL_FILES = ["modal-1.png", "modal-2.png"];
+
+const fmt = (b) => (b / 1024 / 1024).toFixed(2) + "MB";
+const ensureDir = (d) => fs.mkdir(d, { recursive: true });
+const exists = (p) => fs.access(p).then(() => true).catch(() => false);
+
+// Đảm bảo ảnh gốc đã được backup; luôn ĐỌC từ backup để không nén chồng.
+async function sourceFrom(destPath, backupSubdir) {
+  const name = path.basename(destPath);
+  const backupPath = path.join(BACKUP_DIR, backupSubdir, name);
+  await ensureDir(path.dirname(backupPath));
+  if (!(await exists(backupPath))) {
+    await fs.copyFile(destPath, backupPath);
+  }
+  return backupPath;
+}
+
+async function optimizePanoramas() {
+  const files = (await fs.readdir(PANO_DIR)).filter((f) => /\.jpe?g$/i.test(f)).sort();
+  const lqip = {};
+  for (const f of files) {
+    const dest = path.join(PANO_DIR, f);
+    const src = await sourceFrom(dest, "chua-thai-lac");
+    const before = (await fs.stat(dest)).size;
+
+    const buf = await sharp(src)
+      .rotate()
+      .resize({ width: PANO_WIDTH, withoutEnlargement: true })
+      .jpeg({ quality: PANO_QUALITY, mozjpeg: true, progressive: true })
+      .toBuffer();
+    await fs.writeFile(dest, buf);
+
+    const lqipBuf = await sharp(src).rotate().resize({ width: LQIP_WIDTH }).jpeg({ quality: 40 }).toBuffer();
+    lqip["/images/chua-thai-lac/" + f] = "data:image/jpeg;base64," + lqipBuf.toString("base64");
+
+    console.log(`${f}: ${fmt(before)} -> ${fmt(buf.length)} (-${Math.round((1 - buf.length / before) * 100)}%)`);
+  }
+  return lqip;
+}
+
+async function optimizeModals() {
+  for (const f of MODAL_FILES) {
+    const dest = path.join(MODAL_DIR, f);
+    if (!(await exists(dest))) continue;
+    const src = await sourceFrom(dest, "modal");
+    const before = (await fs.stat(dest)).size;
+    const buf = await sharp(src).png({ compressionLevel: 9, palette: true, quality: 90, dither: 1 }).toBuffer();
+    await fs.writeFile(dest, buf);
+    console.log(`${f}: ${fmt(before)} -> ${fmt(buf.length)}`);
+  }
+}
+
+async function writeLqip(lqip) {
+  const entries = Object.entries(lqip)
+    .map(([k, v]) => `  ${JSON.stringify(k)}: ${JSON.stringify(v)},`)
+    .join("\n");
+  const content =
+    "// TỰ ĐỘNG SINH bởi scripts/optimize-images.mjs — KHÔNG sửa tay.\n" +
+    "// Ảnh mờ tạm (blur-up/LQIP) base64 cho mỗi panorama, khoá theo đường dẫn ảnh.\n" +
+    "export const lqip: Record<string, string> = {\n" +
+    entries +
+    "\n};\n";
+  await fs.writeFile(LQIP_OUT, content);
+  console.log("Wrote " + path.relative(ROOT, LQIP_OUT) + " (" + Object.keys(lqip).length + " entries)");
+}
+
+const lqip = await optimizePanoramas();
+await optimizeModals();
+await writeLqip(lqip);
+console.log("Done.");
+```
+
+- [ ] **Step 2: Thêm `/image-originals` vào .gitignore**
+
+Append to `.gitignore` (sau dòng `.vercel` cuối file):
+
+```
+# ảnh gốc trước khi nén (backup cục bộ)
+/image-originals
+```
+
+- [ ] **Step 3: Kiểm tra script parse được (không chạy nén)**
+
+Run: `node --check scripts/optimize-images.mjs`
+Expected: không in lỗi (exit 0).
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add scripts/optimize-images.mjs .gitignore
+git commit -m "feat: script nén ảnh panorama + LQIP
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 2: Chạy nén ảnh + commit tài sản đã nén
+
+**Files:**
+- Modify (ghi đè): `public/images/chua-thai-lac/*.jpg`, `public/modal/modal-1.png`, `public/modal/modal-2.png`
+- Create: `src/app/tours/chua-thai-lac.lqip.ts`
+- Create (gitignored): `image-originals/...`
+
+- [ ] **Step 1: Chạy script nén**
+
+Run: `node scripts/optimize-images.mjs`
+Expected: in từng dòng `01.jpg: 22.64MB -> ~1.xMB (-9x%)` … và `Wrote src/app/tours/chua-thai-lac.lqip.ts (23 entries)` rồi `Done.`
+
+- [ ] **Step 2: Xác nhận dung lượng đã giảm**
+
+Run: `du -sh public/images/chua-thai-lac && du -sh image-originals/chua-thai-lac`
+Expected: `public/images/chua-thai-lac` ~25–35MB; `image-originals/chua-thai-lac` ~394MB (bản gốc đã backup).
+
+- [ ] **Step 3: Xác nhận LQIP đã sinh đúng số lượng**
+
+Run: `grep -c "data:image/jpeg;base64" src/app/tours/chua-thai-lac.lqip.ts`
+Expected: `23`
+
+- [ ] **Step 4: Xác nhận `image-originals` không bị git theo dõi**
+
+Run: `git status --porcelain image-originals | head`
+Expected: không có dòng nào (thư mục bị ignore).
+
+- [ ] **Step 5: Kiểm tra mắt vài ảnh** (thủ công)
+
+Mở `public/images/chua-thai-lac/01.jpg`, `12.jpg`, `21.jpg` bằng trình xem ảnh. Expected: rõ nét, không vỡ hạt rõ rệt, đúng nội dung. Mở `public/modal/modal-1.png` — Expected: vẫn giữ trong suốt, không banding nặng. (Nếu modal banding rõ: chấp nhận hoặc khôi phục từ `image-originals/modal/` và bỏ phần modal trong script.)
+
+- [ ] **Step 6: Commit ảnh đã nén + LQIP**
+
+```bash
+git add public/images/chua-thai-lac src/app/tours/chua-thai-lac.lqip.ts public/modal
+git commit -m "perf: nén panorama 394MB->~30MB + sinh LQIP, nén modal PNG
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 3: Bản đồ "Vị trí" auto-fit
+
+**Files:**
+- Modify: `src/app/components/VirtualTour.tsx` (hàm `MiniMap`, phần `getMapPosition`)
+
+- [ ] **Step 1: Thay phép co cứng bằng auto-fit theo bao toàn bộ điểm**
+
+Find (trong hàm `MiniMap`):
+
+```js
+  const { mapRoutes, sceneById, scenes } = tourConfig;
+  const isOverview = mode === "overview";
+  const nodeSize = compact ? 5.2 : 5.2;
+  const edgeInset = nodeSize / 2;
+  const clampMapPoint = (value: number) => THREE.MathUtils.clamp(value, edgeInset, 100 - edgeInset);
+  const compressOverviewY = (value: number) => 50 + (value - 50) * 0.86;
+  const getMapPosition = (scene: TourScene) => {
+    if (!scene.mapPosition || (!isOverview && !activeScene.mapPosition)) return null;
+
+    if (isOverview) {
+      return {
+        x: clampMapPoint(scene.mapPosition.x),
+        y: clampMapPoint(compressOverviewY(scene.mapPosition.y)),
+      };
+    }
+```
+
+Replace with:
+
+```js
+  const { mapRoutes, sceneById, scenes } = tourConfig;
+  const isOverview = mode === "overview";
+  const nodeSize = compact ? 5.2 : 5.2;
+  const edgeInset = nodeSize / 2;
+  const clampMapPoint = (value: number) => THREE.MathUtils.clamp(value, edgeInset, 100 - edgeInset);
+
+  // Auto-fit overview: co toàn bộ điểm vào khung với lề an toàn để không bị cắt.
+  const OVERVIEW_MARGIN = 8;
+  const overviewPts = scenes
+    .map((s) => s.mapPosition)
+    .filter((p): p is { x: number; y: number } => Boolean(p));
+  const overviewBounds = {
+    minX: Math.min(...overviewPts.map((p) => p.x)),
+    maxX: Math.max(...overviewPts.map((p) => p.x)),
+    minY: Math.min(...overviewPts.map((p) => p.y)),
+    maxY: Math.max(...overviewPts.map((p) => p.y)),
+  };
+  const fitOverview = (value: number, min: number, max: number) =>
+    max - min < 0.0001
+      ? 50
+      : OVERVIEW_MARGIN + ((value - min) / (max - min)) * (100 - 2 * OVERVIEW_MARGIN);
+
+  const getMapPosition = (scene: TourScene) => {
+    if (!scene.mapPosition || (!isOverview && !activeScene.mapPosition)) return null;
+
+    if (isOverview) {
+      return {
+        x: clampMapPoint(fitOverview(scene.mapPosition.x, overviewBounds.minX, overviewBounds.maxX)),
+        y: clampMapPoint(fitOverview(scene.mapPosition.y, overviewBounds.minY, overviewBounds.maxY)),
+      };
+    }
+```
+
+- [ ] **Step 2: Type-check**
+
+Run: `npx tsc --noEmit`
+Expected: exit 0, không lỗi (đặc biệt không còn cảnh báo `compressOverviewY` unused vì đã xoá).
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add src/app/components/VirtualTour.tsx
+git commit -m "fix: bản đồ Vị trí auto-fit, không cắt điểm, căn giữa cân đối
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 4: Bỏ preserveDrawingBuffer + hạ pixelRatio
+
+**Files:**
+- Modify: `src/app/components/VirtualTour.tsx` (cấu hình `WebGLRenderer` của tour, trong useEffect khởi tạo three)
+
+- [ ] **Step 1: Sửa cấu hình renderer**
+
+Find:
+
+```js
+    const renderer = new THREE.WebGLRenderer({
+      antialias: true,
+      alpha: false,
+      preserveDrawingBuffer: true,
+      powerPreference: "high-performance",
+    });
+    renderer.outputColorSpace = THREE.SRGBColorSpace;
+    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 1.8));
+```
+
+Replace with:
+
+```js
+    const renderer = new THREE.WebGLRenderer({
+      antialias: true,
+      alpha: false,
+      powerPreference: "high-performance",
+    });
+    renderer.outputColorSpace = THREE.SRGBColorSpace;
+    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 1.5));
+```
+
+- [ ] **Step 2: Type-check**
+
+Run: `npx tsc --noEmit`
+Expected: exit 0.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add src/app/components/VirtualTour.tsx
+git commit -m "perf: bỏ preserveDrawingBuffer, hạ pixelRatio cap xuống 1.5
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 5: Render theo nhu cầu (on-demand) + throttle cameraYaw
+
+**Files:**
+- Modify: `src/app/components/VirtualTour.tsx` (khai báo ref ở đầu component; hàm `animate`; đăng ký listener `controls`)
+
+Mục tiêu: khi người dùng đứng yên, không vẽ thừa và không gọi `setCameraYaw` mỗi frame (đang gây React re-render 60 lần/giây).
+
+- [ ] **Step 1: Thêm 2 ref điều phối render**
+
+Find (cụm ref gần đầu component `TourExperience`, ngay sau dòng `const currentFovRef = useRef(DEFAULT_FOV);`):
+
+```js
+  const currentFovRef = useRef(DEFAULT_FOV);
+  const targetFovRef = useRef(DEFAULT_FOV);
+```
+
+Replace with:
+
+```js
+  const currentFovRef = useRef(DEFAULT_FOV);
+  const targetFovRef = useRef(DEFAULT_FOV);
+  const needsRenderRef = useRef(true);
+  const lastYawRef = useRef(0);
+```
+
+- [ ] **Step 2: Đăng ký listener `controls 'change'` để bật cờ render**
+
+Find:
+
+```js
+    renderer.domElement.addEventListener("wheel", handleWheel, { passive: false });
+```
+
+Replace with:
+
+```js
+    const handleControlsChange = () => {
+      needsRenderRef.current = true;
+    };
+    controls.addEventListener("change", handleControlsChange);
+
+    renderer.domElement.addEventListener("wheel", handleWheel, { passive: false });
+```
+
+- [ ] **Step 3: Gỡ listener khi cleanup**
+
+Find:
+
+```js
+      renderer.setAnimationLoop(null);
+      controls.dispose();
+```
+
+Replace with:
+
+```js
+      controls.removeEventListener("change", handleControlsChange);
+      renderer.setAnimationLoop(null);
+      controls.dispose();
+```
+
+- [ ] **Step 4: Viết lại `animate` để vẽ theo nhu cầu**
+
+Find:
+
+```js
+    const animate = () => {
+      const targetFov = targetFovRef.current;
+
+      if (Math.abs(currentFovRef.current - targetFov) > 0.01) {
+        currentFovRef.current += (targetFov - currentFovRef.current) * 0.16;
+        camera.fov = currentFovRef.current;
+        camera.updateProjectionMatrix();
+      } else if (camera.fov !== targetFov) {
+        currentFovRef.current = targetFov;
+        camera.fov = targetFov;
+        camera.updateProjectionMatrix();
+      }
+
+      if (!vrModeRef.current) {
+        controls.update();
+      }
+
+      // Update camera yaw for mini-map rotation
+      const direction = new THREE.Vector3();
+      camera.getWorldDirection(direction);
+      const yaw = yawFromDirection(direction);
+      setCameraYaw(yaw);
+
+      updateHotspots();
+
+      renderer.render(threeScene, camera);
+    };
+```
+
+Replace with:
+
+```js
+    const animate = () => {
+      const targetFov = targetFovRef.current;
+      const fovAnimating = Math.abs(currentFovRef.current - targetFov) > 0.01;
+
+      if (fovAnimating) {
+        currentFovRef.current += (targetFov - currentFovRef.current) * 0.16;
+        camera.fov = currentFovRef.current;
+        camera.updateProjectionMatrix();
+      } else if (camera.fov !== targetFov) {
+        currentFovRef.current = targetFov;
+        camera.fov = targetFov;
+        camera.updateProjectionMatrix();
+        needsRenderRef.current = true;
+      }
+
+      // controls.update() trả về true khi camera vừa thay đổi (kể cả damping đang lắng).
+      const controlsChanged = vrModeRef.current ? false : controls.update();
+      const transitionActive = transitionFrameRef.current !== null;
+      const active =
+        needsRenderRef.current ||
+        fovAnimating ||
+        controlsChanged ||
+        controls.autoRotate ||
+        vrModeRef.current ||
+        transitionActive;
+
+      if (!active) {
+        return;
+      }
+      needsRenderRef.current = false;
+
+      // Cập nhật yaw cho mini-map — chỉ setState khi đổi đủ lớn để tránh re-render thừa.
+      const direction = new THREE.Vector3();
+      camera.getWorldDirection(direction);
+      const yaw = yawFromDirection(direction);
+      if (Math.abs(normalizeYaw(yaw - lastYawRef.current)) > 0.15) {
+        lastYawRef.current = yaw;
+        setCameraYaw(yaw);
+      }
+
+      updateHotspots();
+      renderer.render(threeScene, camera);
+    };
+```
+
+- [ ] **Step 5: Type-check**
+
+Run: `npx tsc --noEmit`
+Expected: exit 0.
+
+- [ ] **Step 6: Kiểm tra hành vi thủ công** (`npm run dev`)
+
+Mở tour. Expected: kéo xoay mượt; thả tay cảnh đứng yên (không nhấp nháy); zoom (cuộn chuột) mượt; auto-rotate quay đều; chuyển cảnh qua mũi tên hoạt động; mini-map radar vẫn xoay theo góc nhìn; bật VR (trên máy có cảm biến) vẫn cập nhật. Không có cảnh "đứng hình" sau tương tác.
+
+- [ ] **Step 7: Commit**
+
+```bash
+git add src/app/components/VirtualTour.tsx
+git commit -m "perf: render theo nhu cầu + throttle cameraYaw (giảm tải khi đứng yên)
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 6: Preload thông minh (lùi xuống lúc rảnh)
+
+**Files:**
+- Modify: `src/app/components/VirtualTour.tsx` (helper module-level `scheduleIdle`; hàm `preloadTourScene`)
+
+- [ ] **Step 1: Thêm helper `scheduleIdle` ở cấp module**
+
+Find (helper module-level, ngay sau hàm `directionFromYawPitch`):
+
+```js
+function directionFromYawPitch(yaw: number, pitch: number) {
+  const yawRad = THREE.MathUtils.degToRad(yaw);
+  const pitchRad = THREE.MathUtils.degToRad(pitch);
+  const cosPitch = Math.cos(pitchRad);
+
+  return new THREE.Vector3(
+    Math.sin(yawRad) * cosPitch,
+    Math.sin(pitchRad),
+    -Math.cos(yawRad) * cosPitch,
+  );
+}
+```
+
+Add immediately after it:
+
+```js
+type IdleWindow = typeof window & {
+  requestIdleCallback?: (cb: () => void, opts?: { timeout: number }) => number;
+};
+
+// Lên lịch chạy lúc trình duyệt rảnh (fallback setTimeout) — dùng cho preload nền.
+function scheduleIdle(cb: () => void) {
+  if (typeof window === "undefined") {
+    return;
+  }
+  const w = window as IdleWindow;
+  if (w.requestIdleCallback) {
+    w.requestIdleCallback(cb, { timeout: 2000 });
+  } else {
+    window.setTimeout(cb, 400);
+  }
+}
+```
+
+- [ ] **Step 2: Cảnh hiện tại tải ngay, cảnh kề preload lúc rảnh**
+
+Find:
+
+```js
+  const preloadTourScene = useCallback(
+    (scene: TourScene) => {
+      const preloadImage = (image: string) => {
+        loadPanoramaTexture(image)
+          .then((texture) => warmPanoramaTexture(image, texture))
+          .catch(() => undefined);
+      };
+
+      preloadImage(scene.image);
+      scene.hotspots.forEach((hotspot) => {
+        const targetScene = tourConfig.sceneById.get(hotspot.targetId);
+
+        if (targetScene) {
+          preloadImage(targetScene.image);
+        }
+      });
+    },
+    [tourConfig, warmPanoramaTexture],
+  );
+```
+
+Replace with:
+
+```js
+  const preloadTourScene = useCallback(
+    (scene: TourScene) => {
+      const preloadImage = (image: string) => {
+        loadPanoramaTexture(image)
+          .then((texture) => warmPanoramaTexture(image, texture))
+          .catch(() => undefined);
+      };
+
+      // Cảnh hiện tại: tải ngay. Cảnh kề: lùi xuống lúc rảnh để không nghẽn khi vừa vào.
+      preloadImage(scene.image);
+      scheduleIdle(() => {
+        scene.hotspots.forEach((hotspot) => {
+          const targetScene = tourConfig.sceneById.get(hotspot.targetId);
+
+          if (targetScene) {
+            preloadImage(targetScene.image);
+          }
+        });
+      });
+    },
+    [tourConfig, warmPanoramaTexture],
+  );
+```
+
+- [ ] **Step 3: Type-check**
+
+Run: `npx tsc --noEmit`
+Expected: exit 0.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/app/components/VirtualTour.tsx
+git commit -m "perf: preload cảnh kề lúc trình duyệt rảnh
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 7: Blur-up (LQIP) khi tải cảnh
+
+**Files:**
+- Modify: `src/app/components/VirtualTour.tsx` (import LQIP; helper `loadLqipTexture`; chèn vào `runSceneTransition` cho cả nhánh chuyển cảnh và nhánh tải cảnh đầu)
+
+Phụ thuộc: `src/app/tours/chua-thai-lac.lqip.ts` (đã sinh ở Task 2) và `needsRenderRef` (đã thêm ở Task 5).
+
+- [ ] **Step 1: Import LQIP**
+
+Find:
+
+```js
+import { chuaThaiLacTour } from "@/app/tours/chua-thai-lac";
+```
+
+Replace with:
+
+```js
+import { chuaThaiLacTour } from "@/app/tours/chua-thai-lac";
+import { lqip } from "@/app/tours/chua-thai-lac.lqip";
+```
+
+- [ ] **Step 2: Thêm cache + loader cho texture mờ (cấp module)**
+
+Find:
+
+```js
+const panoramaTextureCache = new Map<string, THREE.Texture>();
+```
+
+Add immediately before it:
+
+```js
+// Texture ảnh mờ (blur-up) tạo từ data-URI base64 — hiện gần như tức thì khi cảnh đang tải.
+const lqipTextureCache = new Map<string, THREE.Texture>();
+function loadLqipTexture(image: string) {
+  const data = lqip[image];
+  if (!data) {
+    return null;
+  }
+  const cached = lqipTextureCache.get(image);
+  if (cached) {
+    return cached;
+  }
+  const texture = new THREE.TextureLoader().load(data);
+  texture.colorSpace = THREE.SRGBColorSpace;
+  lqipTextureCache.set(image, texture);
+  return texture;
+}
+
+```
+
+- [ ] **Step 3: Blur-up cho nhánh chuyển cảnh (texture chưa cache)**
+
+Find:
+
+```js
+        } else {
+          loadPanoramaTexture(scene.image, (progress) => {
+            if (transitionTokenRef.current === token) {
+              setLoadProgress(progress);
+            }
+          })
+```
+
+Replace with:
+
+```js
+        } else {
+          const lqipTexture = loadLqipTexture(scene.image);
+          if (lqipTexture) {
+            transitionMaterial.map = lqipTexture;
+            transitionMaterial.needsUpdate = true;
+          }
+          loadPanoramaTexture(scene.image, (progress) => {
+            if (transitionTokenRef.current === token) {
+              setLoadProgress(progress);
+            }
+          })
+```
+
+(Khi ảnh nét tải xong, `prepareTransitionTexture` thay `transitionMaterial.map` bằng ảnh nét — chuyển mờ→nét trên cùng cảnh.)
+
+- [ ] **Step 4: Blur-up cho nhánh tải cảnh đầu (initial load)**
+
+Find:
+
+```js
+      setIsLoading(!initialCachedTexture);
+      setLoadProgress(initialCachedTexture ? 100 : 0);
+      loadTexture
+        .then((texture) => {
+```
+
+Replace with:
+
+```js
+      setIsLoading(!initialCachedTexture);
+      setLoadProgress(initialCachedTexture ? 100 : 0);
+      if (!initialCachedTexture) {
+        const lqipTexture = loadLqipTexture(scene.image);
+        if (lqipTexture) {
+          material.map = lqipTexture;
+          material.opacity = 1;
+          material.needsUpdate = true;
+          needsRenderRef.current = true;
+        }
+      }
+      loadTexture
+        .then((texture) => {
+```
+
+- [ ] **Step 5: Type-check**
+
+Run: `npx tsc --noEmit`
+Expected: exit 0.
+
+- [ ] **Step 6: Kiểm tra thủ công** (`npm run dev`, mở DevTools → Network → Slow 3G để thấy rõ)
+
+Expected: khi vào cảnh chưa tải, hiện ảnh **mờ** ngay tức thì rồi sắc nét dần (không còn màn trắng/đen chờ). Chuyển cảnh tới cảnh chưa tải cũng thấy mờ→nét.
+
+- [ ] **Step 7: Commit**
+
+```bash
+git add src/app/components/VirtualTour.tsx
+git commit -m "perf: ảnh mờ blur-up (LQIP) khi tải cảnh
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Task 8: Kiểm tra tổng thể (build + checklist)
+
+**Files:** không sửa — chỉ kiểm chứng.
+
+- [ ] **Step 1: Build production**
+
+Run: `npm run build`
+Expected: build thành công, không lỗi TypeScript/ESLint chặn build.
+
+- [ ] **Step 2: Lint**
+
+Run: `npm run lint`
+Expected: không có lỗi (cảnh báo nhẹ chấp nhận được).
+
+- [ ] **Step 3: Checklist thủ công** (`npm run dev`)
+
+Xác nhận từng mục — Expected: tất cả PASS:
+- Trang chủ/welcome vào tour nhanh, ảnh đầu tiên hiện mờ rồi nét.
+- Kéo xoay, zoom mượt; đứng yên không giật/nhấp nháy.
+- Auto-rotate quay đều; tắt thì dừng vẽ thừa.
+- Mũi tên hướng đi bấm chuyển cảnh đúng; mini-map radar xoay theo.
+- Panel "Vị trí": đủ 23 điểm, căn giữa, **không điểm nào bị cắt** ở mép.
+- Mở info marker, modal hiển thị đúng (ảnh modal không vỡ).
+- (Nếu có thiết bị cảm biến) VR mode hoạt động.
+
+- [ ] **Step 4: Commit (nếu có chỉnh sửa nhỏ phát sinh từ kiểm tra)**
+
+```bash
+git add -A
+git commit -m "chore: hoàn tất tối ưu hiệu năng & bản đồ phy-vr360
+
+Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>"
+```
+
+---
+
+## Self-review notes (đã đối chiếu với spec)
+
+- **Spec Phần A** (nén 6144/q80, backup gốc, modal PNG, LQIP) → Task 1–2. ✓
+- **Spec Phần B** (auto-fit, lề 8%) → Task 3. ✓
+- **Spec Phần C-1** render on-demand → Task 5; **C-2** bỏ preserveDrawingBuffer → Task 4; **C-3** pixelRatio 1.5 → Task 4; **C-4** preload idle → Task 6; **C-5** blur-up → Task 7. ✓
+- **Phase 2** (GLB) cố ý ngoài phạm vi. ✓
+- Type nhất quán: `needsRenderRef` định nghĩa ở Task 5 và dùng lại ở Task 7; `loadLqipTexture`/`lqip` khoá theo `scene.image` (đường dẫn `/images/chua-thai-lac/NN.jpg`) khớp với khoá script sinh ra ở Task 1. ✓
+```

scripts/optimize-images.mjs

@@ -0,0 +1,90 @@
+// Nén ảnh panorama + modal, backup bản gốc, sinh ảnh mờ (LQIP).
+// Chạy: node scripts/optimize-images.mjs  (chạy lại nhiều lần an toàn — luôn nén từ backup gốc)
+import sharp from "sharp";
+import { promises as fs } from "node:fs";
+import path from "node:path";
+
+const ROOT = process.cwd();
+const PANO_DIR = path.join(ROOT, "public/images/chua-thai-lac");
+const MODAL_DIR = path.join(ROOT, "public/modal");
+const BACKUP_DIR = path.join(ROOT, "image-originals");
+const LQIP_OUT = path.join(ROOT, "src/app/tours/chua-thai-lac.lqip.ts");
+
+const PANO_WIDTH = 6144;
+const PANO_QUALITY = 80;
+const LQIP_WIDTH = 32;
+const MODAL_FILES = ["modal-1.png", "modal-2.png"];
+
+const fmt = (b) => (b / 1024 / 1024).toFixed(2) + "MB";
+const ensureDir = (d) => fs.mkdir(d, { recursive: true });
+const exists = (p) => fs.access(p).then(() => true).catch(() => false);
+
+// Đảm bảo ảnh gốc đã được backup; luôn ĐỌC từ backup để không nén chồng.
+async function sourceFrom(destPath, backupSubdir) {
+  const name = path.basename(destPath);
+  const backupPath = path.join(BACKUP_DIR, backupSubdir, name);
+  await ensureDir(path.dirname(backupPath));
+  if (!(await exists(backupPath))) {
+    await fs.copyFile(destPath, backupPath);
+  }
+  return backupPath;
+}
+
+async function optimizePanoramas() {
+  const files = (await fs.readdir(PANO_DIR)).filter((f) => /\.jpe?g$/i.test(f)).sort();
+  const lqip = {};
+  for (const f of files) {
+    const dest = path.join(PANO_DIR, f);
+    const src = await sourceFrom(dest, "chua-thai-lac");
+    const before = (await fs.stat(dest)).size;
+
+    const buf = await sharp(src)
+      .rotate()
+      .resize({ width: PANO_WIDTH, withoutEnlargement: true })
+      .jpeg({ quality: PANO_QUALITY, mozjpeg: true, progressive: true })
+      .toBuffer();
+    await fs.writeFile(dest, buf);
+
+    const lqipBuf = await sharp(src).rotate().resize({ width: LQIP_WIDTH }).jpeg({ quality: 40 }).toBuffer();
+    lqip["/images/chua-thai-lac/" + f] = "data:image/jpeg;base64," + lqipBuf.toString("base64");
+
+    console.log(`${f}: ${fmt(before)} -> ${fmt(buf.length)} (-${Math.round((1 - buf.length / before) * 100)}%)`);
+  }
+  return lqip;
+}
+
+async function optimizeModals() {
+  for (const f of MODAL_FILES) {
+    const dest = path.join(MODAL_DIR, f);
+    if (!(await exists(dest))) continue;
+    const src = await sourceFrom(dest, "modal");
+    const before = (await fs.stat(dest)).size;
+    const buf = await sharp(src).png({ compressionLevel: 9, palette: true, quality: 90, dither: 1 }).toBuffer();
+    await fs.writeFile(dest, buf);
+    console.log(`${f}: ${fmt(before)} -> ${fmt(buf.length)}`);
+  }
+}
+
+async function writeLqip(lqip) {
+  const entries = Object.entries(lqip)
+    .map(([k, v]) => `  ${JSON.stringify(k)}: ${JSON.stringify(v)},`)
+    .join("\n");
+  const content =
+    "// TỰ ĐỘNG SINH bởi scripts/optimize-images.mjs — KHÔNG sửa tay.\n" +
+    "// Ảnh mờ tạm (blur-up/LQIP) base64 cho mỗi panorama, khoá theo đường dẫn ảnh.\n" +
+    "export const lqip: Record<string, string> = {\n" +
+    entries +
+    "\n};\n";
+  await fs.writeFile(LQIP_OUT, content);
+  console.log("Wrote " + path.relative(ROOT, LQIP_OUT) + " (" + Object.keys(lqip).length + " entries)");
+}
+
+try {
+  const lqip = await optimizePanoramas();
+  await optimizeModals();
+  await writeLqip(lqip);
+  console.log("Done.");
+} catch (err) {
+  console.error("optimize-images failed:", err);
+  process.exit(1);
+}

src/app/components/VirtualTour.tsx

@@ -27,6 +27,7 @@ import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
 import Lottie, { type LottieRefCurrentProps } from "lottie-react";
 import letterAnimation from "@/letter.json";
 import { chuaThaiLacTour } from "@/app/tours/chua-thai-lac";
+import { lqip } from "@/app/tours/chua-thai-lac.lqip";
 
 type SceneId = string;
 
@@ -193,6 +194,23 @@ const defaultTourConfig = chuaThaiLacTourConfig;
 
 const getTourConfig = (tourId?: string) => toursById[tourId ?? ""] ?? defaultTourConfig;
 
+// Texture ảnh mờ (blur-up) tạo từ data-URI base64 — hiện gần như tức thì khi cảnh đang tải.
+const lqipTextureCache = new Map<string, THREE.Texture>();
+function loadLqipTexture(image: string) {
+  const data = lqip[image];
+  if (!data) {
+    return null;
+  }
+  const cached = lqipTextureCache.get(image);
+  if (cached) {
+    return cached;
+  }
+  const texture = new THREE.TextureLoader().load(data);
+  texture.colorSpace = THREE.SRGBColorSpace;
+  lqipTextureCache.set(image, texture);
+  return texture;
+}
+
 const panoramaTextureCache = new Map<string, THREE.Texture>();
 const panoramaTexturePromises = new Map<string, Promise<THREE.Texture>>();
 const panoramaTextureProgress = new Map<string, number>();
@@ -294,6 +312,23 @@ function directionFromYawPitch(yaw: number, pitch: number) {
   );
 }
 
+type IdleWindow = typeof window & {
+  requestIdleCallback?: (cb: () => void, opts?: { timeout: number }) => number;
+};
+
+// Lên lịch chạy lúc trình duyệt rảnh (fallback setTimeout) — dùng cho preload nền.
+function scheduleIdle(cb: () => void) {
+  if (typeof window === "undefined") {
+    return;
+  }
+  const w = window as IdleWindow;
+  if (w.requestIdleCallback) {
+    w.requestIdleCallback(cb, { timeout: 2000 });
+  } else {
+    window.setTimeout(cb, 400);
+  }
+}
+
 export default function VirtualTour({
   tourId = "chua-thai-lac",
 }: {
@@ -958,6 +993,8 @@ function TourExperience({
   const transitionLockRef = useRef(false);
   const currentFovRef = useRef(DEFAULT_FOV);
   const targetFovRef = useRef(DEFAULT_FOV);
+  const needsRenderRef = useRef(true);
+  const lastYawRef = useRef(0);
   const lastPinchDistanceRef = useRef<number | null>(null);
   const infoMarkerRefs = useRef<Map<string, HTMLButtonElement>>(new Map());
   const [activeInfoMarker, setActiveInfoMarker] = useState<InfoMarker | null>(null);
@@ -1280,7 +1317,9 @@ function TourExperience({
           .catch(() => undefined);
       };
 
+      // Cảnh hiện tại: tải ngay. Cảnh kề: lùi xuống lúc rảnh để không nghẽn khi vừa vào.
       preloadImage(scene.image);
+      scheduleIdle(() => {
         scene.hotspots.forEach((hotspot) => {
           const targetScene = tourConfig.sceneById.get(hotspot.targetId);
 
@@ -1288,6 +1327,7 @@ function TourExperience({
             preloadImage(targetScene.image);
           }
         });
+      });
     },
     [tourConfig, warmPanoramaTexture],
   );
@@ -1302,11 +1342,10 @@ function TourExperience({
     const renderer = new THREE.WebGLRenderer({
       antialias: true,
       alpha: false,
-      preserveDrawingBuffer: true,
       powerPreference: "high-performance",
     });
     renderer.outputColorSpace = THREE.SRGBColorSpace;
-    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 1.8));
+    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 1.5));
     renderer.setSize(mount.clientWidth, mount.clientHeight);
     mount.appendChild(renderer.domElement);
     rendererRef.current = renderer;
@@ -1429,6 +1468,11 @@ function TourExperience({
       }
     };
 
+    const handleControlsChange = () => {
+      needsRenderRef.current = true;
+    };
+    controls.addEventListener("change", handleControlsChange);
+
     renderer.domElement.addEventListener("wheel", handleWheel, { passive: false });
     renderer.domElement.addEventListener("touchstart", handleTouchStart, { passive: false });
     renderer.domElement.addEventListener("touchmove", handleTouchMove, { passive: false });
@@ -1451,13 +1495,15 @@ function TourExperience({
       camera.aspect = width / height;
       camera.updateProjectionMatrix();
       renderer.setSize(width, height);
+      needsRenderRef.current = true;
       updateHotspots();
     };
 
     const animate = () => {
       const targetFov = targetFovRef.current;
+      const fovAnimating = Math.abs(currentFovRef.current - targetFov) > 0.01;
 
-      if (Math.abs(currentFovRef.current - targetFov) > 0.01) {
+      if (fovAnimating) {
         currentFovRef.current += (targetFov - currentFovRef.current) * 0.16;
         camera.fov = currentFovRef.current;
         camera.updateProjectionMatrix();
@@ -1465,20 +1511,35 @@ function TourExperience({
         currentFovRef.current = targetFov;
         camera.fov = targetFov;
         camera.updateProjectionMatrix();
+        needsRenderRef.current = true;
       }
 
-      if (!vrModeRef.current) {
-        controls.update();
-      }
+      // controls.update() trả về true khi camera vừa thay đổi (kể cả damping đang lắng).
+      const controlsChanged = vrModeRef.current ? false : controls.update();
+      const transitionActive = transitionFrameRef.current !== null;
+      const active =
+        needsRenderRef.current ||
+        fovAnimating ||
+        controlsChanged ||
+        controls.autoRotate ||
+        vrModeRef.current ||
+        transitionActive;
 
-      // Update camera yaw for mini-map rotation
+      if (!active) {
+        return;
+      }
+      needsRenderRef.current = false;
+
+      // Cập nhật yaw cho mini-map — chỉ setState khi đổi đủ lớn để tránh re-render thừa.
       const direction = new THREE.Vector3();
       camera.getWorldDirection(direction);
       const yaw = yawFromDirection(direction);
+      if (Math.abs(normalizeYaw(yaw - lastYawRef.current)) > 0.15) {
+        lastYawRef.current = yaw;
         setCameraYaw(yaw);
+      }
 
       updateHotspots();
-
       renderer.render(threeScene, camera);
     };
 
@@ -1496,6 +1557,7 @@ function TourExperience({
       renderer.domElement.removeEventListener("pointermove", handlePointerMove);
       renderer.domElement.removeEventListener("pointerup", handlePointerEnd);
       renderer.domElement.removeEventListener("pointercancel", handlePointerEnd);
+      controls.removeEventListener("change", handleControlsChange);
       renderer.setAnimationLoop(null);
       controls.dispose();
       geometry.dispose();
@@ -1703,6 +1765,15 @@ function TourExperience({
 
       setIsLoading(!initialCachedTexture);
       setLoadProgress(initialCachedTexture ? 100 : 0);
+      if (!initialCachedTexture) {
+        const lqipTexture = loadLqipTexture(scene.image);
+        if (lqipTexture) {
+          material.map = lqipTexture;
+          material.opacity = 1;
+          material.needsUpdate = true;
+          needsRenderRef.current = true;
+        }
+      }
       loadTexture
         .then((texture) => {
           if (transitionTokenRef.current !== token) return;
@@ -2941,14 +3012,30 @@ function MiniMap({
   const nodeSize = compact ? 5.2 : 5.2;
   const edgeInset = nodeSize / 2;
   const clampMapPoint = (value: number) => THREE.MathUtils.clamp(value, edgeInset, 100 - edgeInset);
-  const compressOverviewY = (value: number) => 50 + (value - 50) * 0.86;
+
+  // Auto-fit overview: co toàn bộ điểm vào khung với lề an toàn để không bị cắt.
+  const OVERVIEW_MARGIN = 8;
+  const overviewPts = scenes
+    .map((s) => s.mapPosition)
+    .filter((p): p is { x: number; y: number } => Boolean(p));
+  const overviewBounds = {
+    minX: Math.min(...overviewPts.map((p) => p.x)),
+    maxX: Math.max(...overviewPts.map((p) => p.x)),
+    minY: Math.min(...overviewPts.map((p) => p.y)),
+    maxY: Math.max(...overviewPts.map((p) => p.y)),
+  };
+  const fitOverview = (value: number, min: number, max: number) =>
+    max - min < 0.0001
+      ? 50
+      : OVERVIEW_MARGIN + ((value - min) / (max - min)) * (100 - 2 * OVERVIEW_MARGIN);
+
   const getMapPosition = (scene: TourScene) => {
     if (!scene.mapPosition || (!isOverview && !activeScene.mapPosition)) return null;
 
     if (isOverview) {
       return {
-        x: clampMapPoint(scene.mapPosition.x),
-        y: clampMapPoint(compressOverviewY(scene.mapPosition.y)),
+        x: clampMapPoint(fitOverview(scene.mapPosition.x, overviewBounds.minX, overviewBounds.maxX)),
+        y: clampMapPoint(fitOverview(scene.mapPosition.y, overviewBounds.minY, overviewBounds.maxY)),
       };
     }
 

src/app/tours/chua-thai-lac.lqip.ts

@@ -0,0 +1,30 @@
+// TỰ ĐỘNG SINH bởi scripts/optimize-images.mjs — KHÔNG sửa tay.
+// Ảnh mờ tạm (blur-up/LQIP) base64 cho mỗi panorama, khoá theo đường dẫn ảnh.
+export const lqip: Record<string, string> = {
+  "/images/chua-thai-lac/01.jpg": "data:image/jpeg;base64,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",
+  "/images/chua-thai-lac/02.jpg": "data:image/jpeg;base64,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",
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