diff --git a/manual_trading_hub/static/app.css b/manual_trading_hub/static/app.css
index cb243f5..18e7fc6 100644
--- a/manual_trading_hub/static/app.css
+++ b/manual_trading_hub/static/app.css
@@ -160,6 +160,17 @@ a:hover {
   background: rgba(255, 77, 109, 0.1);
 }
 
+.sys-pill.syncing {
+  opacity: 0.85;
+  animation: sys-pill-pulse 1.2s ease-in-out infinite;
+}
+
+@keyframes sys-pill-pulse {
+  50% {
+    opacity: 0.55;
+  }
+}
+
 .top-nav {
   display: flex;
   gap: 4px;
diff --git a/manual_trading_hub/static/app.js b/manual_trading_hub/static/app.js
index e75b212..91d811a 100644
--- a/manual_trading_hub/static/app.js
+++ b/manual_trading_hub/static/app.js
@@ -6,6 +6,10 @@
   let tpslPending = null;
   let lastMonitorRows = [];
   let expandedExchangeId = sessionStorage.getItem("hub_expanded_ex") || "";
+  const HUB_MONITOR_BOARD_CACHE_KEY = "hub_monitor_board_v1";
+  const HUB_MONITOR_CACHE_MAX_AGE_MS = 6 * 60 * 60 * 1000;
+  let monitorBoardFetchSeq = 0;
+  let lastMonitorBoardUpdatedAt = "";
 
   async function apiFetch(url, opts) {
     const r = await fetch(url, opts);
@@ -344,11 +348,78 @@
     monitorTimer = null;
   }
 
+  function saveMonitorBoardCache(rows, updatedAt) {
+    try {
+      sessionStorage.setItem(
+        HUB_MONITOR_BOARD_CACHE_KEY,
+        JSON.stringify({
+          version: 1,
+          updated_at: updatedAt || "",
+          rows: rows || [],
+          saved_at: Date.now(),
+        })
+      );
+    } catch (_) {}
+  }
+
+  function loadMonitorBoardFromCache() {
+    try {
+      const raw = sessionStorage.getItem(HUB_MONITOR_BOARD_CACHE_KEY);
+      if (!raw) return null;
+      const data = JSON.parse(raw);
+      if (!data || !Array.isArray(data.rows) || !data.rows.length) return null;
+      const age = Date.now() - Number(data.saved_at || 0);
+      if (!Number.isFinite(age) || age > HUB_MONITOR_CACHE_MAX_AGE_MS) {
+        sessionStorage.removeItem(HUB_MONITOR_BOARD_CACHE_KEY);
+        return null;
+      }
+      return data;
+    } catch (_) {
+      return null;
+    }
+  }
+
+  function restoreMonitorBoardFromCache() {
+    const cached = loadMonitorBoardFromCache();
+    if (!cached) return false;
+    lastMonitorRows = cached.rows;
+    lastMonitorBoardUpdatedAt = cached.updated_at || "";
+    applyMonitorBoardUi(cached.rows, lastMonitorBoardUpdatedAt, { stale: true });
+    return true;
+  }
+
+  function applyMonitorBoardUi(rows, updatedAt, opts) {
+    const options = opts || {};
+    const tsRaw = updatedAt || lastMonitorBoardUpdatedAt || "";
+    if (updatedAt) lastMonitorBoardUpdatedAt = updatedAt;
+    const online = (rows || []).filter((x) => x.http_ok && (x.agent || {}).ok !== false).length;
+    const pill = document.getElementById("sys-status");
+    if (pill) {
+      pill.textContent = rows.length ? `LINK ${online}/${rows.length}` : "NO DATA";
+      pill.classList.toggle("warn", rows.length && online < rows.length);
+      if (options.stale) pill.classList.add("syncing");
+      else pill.classList.remove("syncing");
+    }
+    const upd = document.getElementById("monitor-updated");
+    if (upd) {
+      const ts = tsRaw.replace("T", " ");
+      upd.textContent = options.stale
+        ? ts
+          ? `缓存 ${ts} · 刷新中…`
+          : "刷新中…"
+        : ts
+          ? `UPD ${ts}`
+          : "";
+    }
+    renderMonitorGrid(rows || []);
+  }
+
   function startMonitorPoll() {
     stopMonitorPoll();
-    loadMonitorBoard();
+    const hadCache = restoreMonitorBoardFromCache();
+    loadMonitorBoard({ background: hadCache });
     if (document.getElementById("auto-monitor").checked) {
-      monitorTimer = setInterval(loadMonitorBoard, 5000);
+      monitorTimer = setInterval(() => loadMonitorBoard({ background: true }), 5000);
     }
   }
 
@@ -502,32 +573,33 @@
     return `<span class="pos-breakeven-badge">已保本</span>`;
   }
 
-  async function loadMonitorBoard() {
+  async function loadMonitorBoard(opts) {
+    const options = opts || {};
+    const background = !!options.background;
     const box = document.getElementById("monitor-grid");
-    const showLoading = !lastMonitorRows.length;
+    const seq = ++monitorBoardFetchSeq;
+    const showLoading = !background && !lastMonitorRows.length;
     if (showLoading && box) {
       box.innerHTML =
         '<div class="board-loading"><span class="board-loading-spin" aria-hidden="true"></span>正在聚合四所数据…</div>';
+    } else if (background && lastMonitorRows.length) {
+      applyMonitorBoardUi(lastMonitorRows, null, { stale: true });
     }
     try {
       const r = await apiFetch("/api/monitor/board");
       const data = await r.json();
+      if (seq !== monitorBoardFetchSeq) return;
       lastMonitorRows = data.rows || [];
-      const online = lastMonitorRows.filter(
-        (x) => x.http_ok && (x.agent || {}).ok !== false
-      ).length;
-      const pill = document.getElementById("sys-status");
-      if (pill) {
-        pill.textContent = lastMonitorRows.length
-          ? `LINK ${online}/${lastMonitorRows.length}`
-          : "NO DATA";
-        pill.classList.toggle("warn", lastMonitorRows.length && online < lastMonitorRows.length);
-      }
-      document.getElementById("monitor-updated").textContent =
-        "UPD " + (data.updated_at || "").replace("T", " ");
-      renderMonitorGrid(lastMonitorRows);
+      saveMonitorBoardCache(lastMonitorRows, data.updated_at);
+      applyMonitorBoardUi(lastMonitorRows, data.updated_at, { stale: false });
     } catch (e) {
-      box.innerHTML = `<div class="err">${esc(e)}</div>`;
+      if (seq !== monitorBoardFetchSeq) return;
+      if (background && lastMonitorRows.length) {
+        showToast("监控数据刷新失败，仍显示上次缓存", true);
+        applyMonitorBoardUi(lastMonitorRows, null, { stale: false });
+        return;
+      }
+      if (box) box.innerHTML = `<div class="err">${esc(e)}</div>`;
     }
   }
 
@@ -1826,12 +1898,30 @@
   initFullscreen();
   initMobileLayout();
 
+  function initShellNav() {
+    document.querySelectorAll(".top-nav a[href^='/']").forEach((a) => {
+      a.addEventListener("click", (ev) => {
+        const href = a.getAttribute("href");
+        if (!href || ev.ctrlKey || ev.metaKey || ev.shiftKey || ev.altKey) return;
+        ev.preventDefault();
+        const path = href.split("?")[0];
+        if (path === window.location.pathname) {
+          setActiveNav();
+          return;
+        }
+        history.pushState({}, "", href);
+        setActiveNav();
+      });
+    });
+    window.addEventListener("popstate", setActiveNav);
+  }
+
   initAuth().then((ok) => {
     if (!ok) return;
+    initShellNav();
     setActiveNav();
     if (currentPage() === "settings") {
       loadSettings().catch(() => {});
     }
-    window.addEventListener("popstate", setActiveNav);
   });
 })();
diff --git a/manual_trading_hub/static/index.html b/manual_trading_hub/static/index.html
index 04b2830..533c07e 100644
--- a/manual_trading_hub/static/index.html
+++ b/manual_trading_hub/static/index.html
@@ -245,6 +245,6 @@
   <div id="toast"></div>
   <script src="https://unpkg.com/lightweight-charts@4.2.0/dist/lightweight-charts.standalone.production.js"></script>
   <script src="/assets/chart.js?v=20260528-hub-no-30m"></script>
-  <script src="/assets/app.js?v=20260528-hub-tpsl-fix"></script>
+  <script src="/assets/app.js?v=20260603-hub-monitor-cache"></script>
 </body>
 </html>