修复百分比排序

frontend/admin/dashboard.php

@@ -109,7 +109,7 @@ function applyPercentileFilter() {
     }
     const rows = document.getElementById('rankingList').querySelectorAll('tr');
     if (rows.length === 0) return;
-    const showCount = Math.ceil(totalStudents * (percentile / 100));
+    const showCount = Math.max(1, Math.floor(totalStudents * (percentile / 100)));
     rows.forEach(function(row, index) {
         row.style.display = index < showCount ? '' : 'none';
     });