fix: comprehensive UI fix — all table columns have explicit widths, no ellipsis on data, consistent scroll.x

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

@@ -249,7 +249,6 @@ const StudentsPage: React.FC = () => {
       title: '电话',
       dataIndex: 'phone',
       width: 140,
-      ellipsis: true,
       render: (v: string, record: any) => {
         if (!v) return '-';
         return (
@@ -266,14 +265,12 @@ const StudentsPage: React.FC = () => {
       title: '学号',
       dataIndex: 'studentNumber',
       width: 120,
-      ellipsis: true,
       render: (v: string) => v || '-',
     },
     {
       title: '身份证',
       dataIndex: 'idNumber',
       width: 180,
-      ellipsis: true,
       render: (v: string, record: any) => {
         if (!v) return '-';
         return (
@@ -287,18 +284,20 @@ const StudentsPage: React.FC = () => {
       },
     },
     { title: '民族', dataIndex: 'ethnicity', width: 90 },
-    { title: '紧急联系人', dataIndex: 'emergencyContact', ellipsis: true },
-    { title: '紧急联系人电话', dataIndex: 'emergencyPhone', ellipsis: true },
+    { title: '紧急联系人', dataIndex: 'emergencyContact', width: 100 },
+    { title: '紧急联系人电话', dataIndex: 'emergencyPhone', width: 130 },
     {
       title: '所属机构',
       dataIndex: 'tenant',
+      width: 100,
       render: (tenant: { name?: string } | null) =>
         tenant?.name ? <Tag color="purple">{tenant.name}</Tag> : '-',
     },
-    { title: '负责人', dataIndex: 'supervisor', ellipsis: true },
+    { title: '负责人', dataIndex: 'supervisor', width: 100 },
     {
       title: '状态',
       dataIndex: 'status',
+      width: 80,
       render: (s: string) => <Tag color={statusMap[s]?.color}>{statusMap[s]?.text || s}</Tag>,
     },
     {