fix: enhance emergency contact phone display with masking and view option

apps/admin/src/pages/Students/index.tsx

@@ -322,7 +322,28 @@ const StudentsPage: React.FC = () => {
       },
       { title: '民族', dataIndex: 'ethnicity', width: 90 },
       { title: '紧急联系人', dataIndex: 'emergencyContact', width: 100 },
-      { title: '紧急联系人电话', dataIndex: 'emergencyPhone', width: 130 },
+      {
+        title: '紧急联系人电话',
+        dataIndex: 'emergencyPhone',
+        width: 150,
+        render: (v: string, record: any) => {
+          if (!v) return '-';
+          return (
+            <span>
+              <span style={{ marginRight: 4 }}>{maskPhone(v)}</span>
+              <Button
+                type="link"
+                size="small"
+                style={{ padding: '8px 4px' }}
+                onClick={() => handleViewSensitive(record.id, '紧急联系人电话', v)}
+                title="点击查看完整号码"
+              >
+                <EyeOutlined style={{ fontSize: 12, color: '#999' }} />
+              </Button>
+            </span>
+          );
+        },
+      },
       {
         title: '所属机构',
         dataIndex: 'organization',