Add green accents to admin summary cards

projects/xiaoshu-admin/src/app/pages/operations-overview-metrics.scss

@@ -45,6 +45,28 @@
   white-space: nowrap;
 }
 
+/* Match the member summary's inset top accent on the remaining overview cards. */
+app-operations-stores .summary-grid.overview-metrics > article,
+app-operations-coaches .coach-summary.overview-metrics > article,
+app-operations-learning-reports .report-metrics.overview-metrics > article,
+app-operations-special-training .summary-grid.overview-metrics > article {
+  position: relative;
+}
+
+app-operations-stores .summary-grid.overview-metrics > article::before,
+app-operations-coaches .coach-summary.overview-metrics > article::before,
+app-operations-learning-reports .report-metrics.overview-metrics > article::before,
+app-operations-special-training .summary-grid.overview-metrics > article::before {
+  position: absolute;
+  top: 0;
+  right: 18px;
+  left: 18px;
+  height: 3px;
+  border-radius: 0 0 4px 4px;
+  background: #176c55;
+  content: '';
+}
+
 /* Eight payroll figures form a predictable two-row summary on desktop. */
 app-operations-payroll .payroll-metrics.overview-metrics {
   grid-template-columns: repeat(4, minmax(0, 1fr));