feat: 监控区 2x2 布局与左上今日统计卡

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

manual_trading_hub/static/app.css

@@ -1153,7 +1153,59 @@ html[data-theme="light"] .host-metric-bar {
   display: grid;
   gap: 16px;
   /* 列数由 app.js syncMonitorGridColumns 按卡片数量设置 */
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+
+.grid-monitor.grid-monitor-2x2 {
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+
+.grid-monitor.grid-monitor-with-stats {
+  grid-template-columns: 1fr;
+}
+
+.monitor-stats-card .card-head {
+  padding-bottom: 0;
+}
+
+.monitor-stats-grid {
+  display: grid;
   grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 12px 14px;
+}
+
+.monitor-stat-cell {
+  min-width: 0;
+  padding: 10px 10px 8px;
+  border-radius: 10px;
+  border: 1px solid var(--border-soft);
+  background: color-mix(in srgb, var(--panel-solid) 88%, transparent);
+}
+
+.monitor-stat-label {
+  font-size: 11px;
+  color: var(--muted);
+  margin-bottom: 4px;
+}
+
+.monitor-stat-value {
+  font-family: var(--display);
+  font-size: 22px;
+  font-weight: 600;
+  line-height: 1.15;
+}
+
+.monitor-stat-sub {
+  margin-top: 4px;
+  font-size: 11px;
+  color: var(--muted);
+  line-height: 1.3;
+}
+
+@media (max-width: 720px) {
+  .monitor-stats-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
 }
 
 .card-expand-zone {