总览北京时间改为更易读的纯文本样式，日期格式与拉取时间一致。

Co-authored-by: Cursor <cursoragent@cursor.com>

static/hub.js

@@ -333,7 +333,7 @@
 
   function formatBeijingNow() {
     try {
-      return new Intl.DateTimeFormat("zh-CN", {
+      const parts = new Intl.DateTimeFormat("en-CA", {
         timeZone: "Asia/Shanghai",
         year: "numeric",
         month: "2-digit",
@@ -342,7 +342,26 @@
         minute: "2-digit",
         second: "2-digit",
         hour12: false,
-      }).format(new Date());
+      }).formatToParts(new Date());
+      const get = function (type) {
+        const hit = parts.find(function (p) {
+          return p.type === type;
+        });
+        return hit ? hit.value : "";
+      };
+      return (
+        get("year") +
+        "-" +
+        get("month") +
+        "-" +
+        get("day") +
+        " " +
+        get("hour") +
+        ":" +
+        get("minute") +
+        ":" +
+        get("second")
+      );
     } catch (e) {
       const d = new Date();
       const utc = d.getTime() + d.getTimezoneOffset() * 60000;
@@ -352,9 +371,9 @@
       };
       return (
         bj.getFullYear() +
-        "/" +
+        "-" +
         p(bj.getMonth() + 1) +
-        "/" +
+        "-" +
         p(bj.getDate()) +
         " " +
         p(bj.getHours()) +
@@ -369,7 +388,9 @@
   function tickBeijingClock() {
     const el = document.getElementById("overview-bj-time");
     if (!el) return;
-    el.textContent = formatBeijingNow();
+    const text = formatBeijingNow();
+    el.textContent = text;
+    el.setAttribute("datetime", text.replace(" ", "T") + "+08:00");
   }
 
   function boot() {