fix(ncm): 歌单详情LoadFailed——track/all端点不存在(404)回退detail+分批song_detail已验证链路; 列表误触改按下锁定行+拖动抑制 (agent-227, 真机验证256首出曲) + perf(meowpanel): 屏幕帧整数定点DCT(无FPU软浮点3.96s→0.19s/帧,实测4-5fps)+前端链式轮询防堆积+实测fps显示 (agent-228)

ncm→73422166 已部署; meowpanel→f310a00e 已部署

patch_v2/meowpanel/web/meowpanel.js

@@ -805,42 +805,59 @@
     });
   }
 
-  /* ---------------- 10. 实时屏幕 / 点击遥控 ---------------- */
+  /* ---------------- 10. 实时屏幕 / 点击遥控 ----------------
+   * 轮询改「上一帧到了再取下一帧」（链式 setTimeout，绝不堆积/重叠）：
+   * 每帧下载完成后按目标周期自校正 delay（周期 = max(0, interval - 请求耗时)），
+   * 故名义 fps 被尊重，且请求变慢时自动退化为 1/请求耗时。 */
   let screenTimer = null, screenBusy = false, screenOn = false;
   let screenObjUrl = null, screenFps = 1;
+  let screenLastMs = 0, screenMeasFps = 0;      // 实测帧率（帧间间隔 EMA）
   function stopScreenPoll() {
-    if (screenTimer) { clearInterval(screenTimer); screenTimer = null; }
     screenOn = false;
+    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
   }
   function restartScreenPoll() {
-    if (screenTimer) { clearInterval(screenTimer); screenTimer = null; }
-    const img = $('#screen-img'); if (!img) return;
     screenOn = true;
-    const ms = Math.max(500, Math.round(1000 / screenFps));
-    screenTimer = setInterval(fetchScreen, ms);
+    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
+    // 请求在途时不重复启动（避免并发请求）；在途帧结束后会按最新 screenFps 自续
+    if (!screenBusy) screenTimer = setTimeout(fetchScreen, 0);
   }
   async function fetchScreen() {
     if (screenBusy) return;
     screenBusy = true;
+    const t0 = performance.now();
     try {
       const headers = {};
       const token = storageGet('meowpanel.token');
       if (token) headers['X-MeowToken'] = token;
       const res = await fetch('/api/screen.jpeg?t=' + Date.now() + '&q=70',
         Object.keys(headers).length ? { headers: headers } : undefined);
-      if (!res.ok) { $('#screen-status').textContent = '获取失败（HTTP ' + res.status + '）'; screenBusy = false; return; }
+      if (!res.ok) { $('#screen-status').textContent = '获取失败（HTTP ' + res.status + '）'; return; }
       const blob = await res.blob();
       const url = URL.createObjectURL(blob);
       const img = $('#screen-img');
-      if (!img) { URL.revokeObjectURL(url); screenBusy = false; return; }
+      if (!img) { URL.revokeObjectURL(url); return; }
       img.src = url;
       if (screenObjUrl) URL.revokeObjectURL(screenObjUrl);
       screenObjUrl = url;
-      $('#screen-status').textContent = '已更新 · ' + new Date().toLocaleTimeString();
+      // 实测帧率：上一帧到本帧间隔的 EMA（首帧无间隔）
+      const now = performance.now();
+      if (screenLastMs) {
+        const dt = (now - screenLastMs) / 1000;
+        screenMeasFps = screenMeasFps ? screenMeasFps * 0.7 + (1 / dt) * 0.3 : 1 / dt;
+      }
+      screenLastMs = now;
+      $('#screen-status').textContent = '已更新' + (screenMeasFps ? ' · ' + screenMeasFps.toFixed(1) + ' fps' : '') + ' · ' + new Date().toLocaleTimeString();
     } catch (e) {
       $('#screen-status').textContent = '后端未连接';
     }
     screenBusy = false;
+    // 自校正续链（本轮耗时计入周期，保证名义 fps）
+    if (screenOn) {
+      const intervalMs = Math.max(500, Math.round(1000 / screenFps));
+      const wait = Math.max(0, intervalMs - (performance.now() - t0));
+      screenTimer = setTimeout(fetchScreen, wait);
+    }
   }
   async function screenTap(e) {
     const img = $('#screen-img'); if (!img) return;
@@ -882,8 +899,8 @@
       restartScreenPoll();
     });
     $('#screen-img').addEventListener('click', screenTap);
+    // restartScreenPoll 已排程首帧（上一帧到了再取下一帧），勿再显式 fetch 以免双发
     restartScreenPoll();
-    fetchScreen();
   }
   function bindScreen() {
     // 页面隐藏（切到其它标签页）时停刷；回到本页继续