添加全局刷新按钮

public/js/app.js

@@ -803,9 +803,30 @@
         <div class="user-info">
           <span class="username">${escapeHtml(username)}</span>
           <button class="btn btn-logout" id="btnLogout">退出</button>
+          <button class="btn-refresh-global" id="btnGlobalRefresh" title="全局数据刷新">
+            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+              <path d="M23 4v6h-6M1 20v-6h6M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"></path>
+            </svg>
+          </button>
         </div>
       `;
       document.getElementById('btnLogout').addEventListener('click', handleLogout);
+      document.getElementById('btnGlobalRefresh').addEventListener('click', async () => {
+        const btn = document.getElementById('btnGlobalRefresh');
+        const icon = btn.querySelector('svg');
+        if (icon) icon.style.animation = 'spin 0.8s ease-in-out';
+        
+        await Promise.all([
+          fetchNetworkHistory(true),
+          fetchMetrics(true)
+        ]);
+        
+        if (icon) {
+          setTimeout(() => {
+            icon.style.animation = '';
+          }, 800);
+        }
+      });
     } else {
       user = null;
       dom.btnSettings.style.display = 'none';