refactor(ui): migrate Scenarios page to consistency baseline (ui-consistency ticket 05)

FormDrawer with footer submit at width 720 (keeps Monaco room),
submitting guard, 20-row conditional pagination, Empty locale,
unified delete Popconfirm wording. Preview/template Modals kept as
read-only surfaces.

.scratch/ui-consistency/issues/05-scenarios.md

@@ -5,9 +5,9 @@
 **Blocked by:** 04
 
 **Acceptance criteria:**
-- [ ] 创建/编辑入口统一（表单 Drawer 或保留 Monaco 全屏编辑——以现有主模式为准，但容器样式对齐标准）
-- [ ] 删除有 Popconfirm；模板相关交互不变
-- [ ] 空态 Empty、20 行分页阈值
-- [ ] 现状 Modal 与 Drawer 混用处收敛（保留 Monaco 场景所需的 Modal）
-- [ ] `tsc --noEmit` 通过
+- [x] 创建/编辑入口统一 FormDrawer（width 720 保留 Monaco 编辑空间）
+- [x] 删除有 Popconfirm；模板相关交互不变
+- [x] 空态 Empty、20 行分页阈值
+- [x] Modal 仅保留预览与模板选择（只读/选择型），编辑表单收敛为 FormDrawer
+- [x] `tsc --noEmit` 通过
 - [ ] t480 走查：场景 CRUD + 编辑 + 校验 golden path

frontend/web/src/pages/Scenarios.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useState } from 'react'
 import {
-  Button, Card, Drawer, Form, Input, message, Modal, Popconfirm,
+  Button, Card, Empty, Form, Input, message, Modal, Popconfirm,
   Select, Space, Table, Tag, Tooltip,
 } from 'antd'
 import {
@@ -9,6 +9,7 @@ import {
 } from '@ant-design/icons'
 import Editor from '@monaco-editor/react'
 import { modelConfigsApi, scenariosApi, type Scenario } from '../api'
+import FormDrawer from '../components/FormDrawer'
 import PageWrapper from '../components/PageWrapper'
 import { useResource } from '../hooks/useResource'
 import { colors } from '../tokens'
@@ -50,6 +51,7 @@ export default function ScenariosPage() {
   const [previewOpen, setPreviewOpen] = useState(false)
   const [previewData, setPreviewData] = useState<any>(null)
   const [editingScenario, setEditingScenario] = useState<Scenario | null>(null)
+  const [submitting, setSubmitting] = useState(false)
   const [casesJson, setCasesJson] = useState(YAML_TEMPLATE)
   const [modelBindings, setModelBindings] = useState<Record<string, string>>({})
   const [form] = Form.useForm()
@@ -138,11 +140,21 @@ export default function ScenariosPage() {
     }
 
     if (editingScenario) {
-      await scenariosApi.update(editingScenario.id, payload)
-      message.success('更新成功')
+      setSubmitting(true)
+      try {
+        await scenariosApi.update(editingScenario.id, payload)
+        message.success('更新成功')
+      } finally {
+        setSubmitting(false)
+      }
     } else {
-      await scenariosApi.create(payload)
-      message.success('创建成功')
+      setSubmitting(true)
+      try {
+        await scenariosApi.create(payload)
+        message.success('创建成功')
+      } finally {
+        setSubmitting(false)
+      }
     }
     setDrawerOpen(false)
     reload()
@@ -180,7 +192,7 @@ export default function ScenariosPage() {
           <Tooltip title="编辑">
             <Button size="small" type="text" icon={<EditOutlined />} onClick={() => openEdit(record)} />
           </Tooltip>
-          <Popconfirm title="确认删除？" onConfirm={() => handleDelete(record.id)}>
+          <Popconfirm title="删除该评测场景？" onConfirm={() => handleDelete(record.id)}>
             <Tooltip title="删除">
               <Button size="small" type="text" danger icon={<DeleteOutlined />} />
             </Tooltip>
@@ -217,29 +229,25 @@ export default function ScenariosPage() {
         </Space>
       }
     >
-      {/* 表格区 — 撑满剩余高度 */}
-      <div style={{ flex: 1, minHeight: 0, overflow: 'hidden' }}>
+      <div style={{ height: '100%', overflowY: 'auto', padding: '0 16px 16px' }}>
         <Table
           dataSource={scenarios ?? []}
           columns={columns}
           rowKey="id"
           loading={loading}
-          pagination={{ pageSize: 15, showSizeChanger: true, showTotal: (t) => `共 ${t} 个` }}
-          scroll={{ y: 'calc(100vh - 200px)' }}
-          style={{ height: '100%' }}
+          pagination={(scenarios?.length ?? 0) > 20 ? { pageSize: 20, showTotal: (t) => `共 ${t} 个` } : false}
+          locale={{ emptyText: <Empty description="还没有评测场景" /> }}
         />
       </div>
 
-      <Drawer
+      <FormDrawer
         title={editingScenario ? `编辑评测场景（当前 v${editingScenario.version ?? 1}）` : '新增评测场景'}
         open={drawerOpen}
         onClose={() => setDrawerOpen(false)}
+        onSubmit={handleSubmit}
+        submitting={submitting}
+        okText={editingScenario ? '更新' : '创建'}
         width={720}
-        extra={
-          <Button type="primary" onClick={handleSubmit}>
-            {editingScenario ? '更新' : '创建'}
-          </Button>
-        }
       >
         <Form form={form} layout="vertical">
           <Form.Item name="name" label="名称" rules={[{ required: true, message: '请输入场景名称' }]}>
@@ -309,7 +317,7 @@ export default function ScenariosPage() {
             }}
           />
         </div>
-      </Drawer>
+      </FormDrawer>
 
       <Modal
         title={`场景预览: ${previewData?.name || ''}${previewData?.version != null ? `（v${previewData.version}）` : ''}`}