feat: highlight list cells selected for excel copy

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

web-admin/src/assets/styles/core/app.scss

@@ -1889,6 +1889,19 @@ body {
   }
 }
 
+.list-table.is-excel-copy {
+  th.is-excel-col,
+  td.is-excel-rowhead {
+    background: var(--mint-primary-bg) !important;
+    color: var(--mint-primary-dark);
+  }
+
+  td.is-excel-cell {
+    background: rgba(16, 185, 129, 0.16) !important;
+    box-shadow: inset 0 0 0 1px var(--mint-primary-dark);
+  }
+}
+
 /* 筛选区 label：13px 次要色（对齐 zkxw filter-form 实践；filter-hint 仍为 11px） */
 .page-container .filter-block .el-form-item__label,
 .console-container .filter-block .el-form-item__label,