feat(UI): 展开箭头全站统一为 ExpandChevron 共享组件

- 新增 src/client/views/ExpandChevron.jsx：14x14 chevron-right、success 绿、展开旋转 90°（源自策略 tab 表格行图标）
- 设置页策略分组行首 ▸/▾ 文字箭头改用该组件，并修复箭头与策略名的水平对齐（基线 trick 改 flex 精确居中）
- StrategyTab / TradeRecordsTab 两处重复内联 SVG 收敛为共享组件
- 去掉字段编辑器展开区冗余「收起」按钮（行首箭头/「收起字段」已可收起），清理 onClose prop
- docs: 新增 UI约束-006（展开/收起箭头全站统一）

src/client/views/ExpandChevron.jsx

@@ -0,0 +1,38 @@
+/**
+ * ExpandChevron —— 全站统一的「展开/收起」箭头图标
+ *
+ * 视觉语言与策略 tab 表格行展开图标一致：
+ *  - 14×14 chevron-right（描边圆角），展开时顺时针旋转 90°（0.15s 过渡）
+ *  - 默认使用主题 success 色，可通过 color 覆盖
+ *
+ * 使用方：
+ *  - StrategyTab / TradeRecordsTab：表格行内（纯装饰，行点击切换展开）
+ *  - SettingsSection 策略分组：包在 button 内作为展开开关
+ */
+export function ExpandChevron({ expanded = false, size = 14, color, style }) {
+  return (
+    <svg
+      width={size}
+      height={size}
+      viewBox="0 0 14 14"
+      aria-hidden="true"
+      style={{
+        display: 'inline-block',
+        transition: 'transform .15s ease',
+        transform: expanded ? 'rotate(90deg)' : 'rotate(0deg)',
+        color: color ?? 'var(--dsw-alias-state-success-primary, #2e7d32)',
+        verticalAlign: 'middle',
+        ...style,
+      }}
+    >
+      <path
+        d="M4.5 2.5 L9.5 7 L4.5 11.5"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="2"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+      />
+    </svg>
+  );
+}

src/client/views/SettingsSection.jsx

@@ -13,6 +13,7 @@ import { useState, useEffect, useCallback, Fragment } from 'react';
 import { useRpc } from './connection.jsx';
 import { ToastProvider, useToast } from './Toast.jsx';
 import { StrategyFieldsEditor } from './StrategyFieldsEditor.jsx'; // R-013：策略自定义字段编辑器
+import { ExpandChevron } from './ExpandChevron.jsx'; // 展开箭头与策略 tab 表格行图标统一
 
 /** 确认弹窗 */
 function ConfirmDialog({ title, message, onConfirm, onCancel }) {
@@ -349,12 +350,12 @@ function StrategyGroupSettings() {
                       <button onClick={() => setEditingId(null)} style={{ padding: '2px 8px', cursor: 'pointer', marginLeft: 4 }}>取消</button>
                     </span>
                   ) : (
-                    <span>
+                    <span style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
                       <button
                         onClick={() => { setExpandedId(expandedId === s.id ? null : s.id); }}
-                        style={{ padding: '2px 6px', cursor: 'pointer', border: 'none', background: 'none', fontSize: 12, color: 'var(--dsw-alias-label-secondary, #666)', marginRight: 6 }}
+                        style={{ padding: '2px 4px', cursor: 'pointer', border: 'none', background: 'none', display: 'inline-flex', alignItems: 'center', justifyContent: 'center', lineHeight: 0 }}
                         title={expandedId === s.id ? '收起配置' : '展开配置自定义字段'}
-                      >{expandedId === s.id ? '▾' : '▸'}</button>
+                      ><ExpandChevron expanded={expandedId === s.id} /></button>
                       {s.name}
                     </span>
                   )}
@@ -382,7 +383,6 @@ function StrategyGroupSettings() {
                       strategy={s}
                       saving={fieldSaving}
                       onSave={(fields) => handleSaveConfig(s.id, fields)}
-                      onClose={() => setExpandedId(null)}
                     />
                   </td>
                 </tr>

src/client/views/StrategyFieldsEditor.jsx

@@ -19,10 +19,9 @@ const dangerBtn = { ...btnStyle, borderColor: 'var(--dsw-alias-state-error-prima
  * @param {object} props
  * @param {object} props.strategy 策略（含 configSchema）
  * @param {Function} props.onSave 保存回调 (fields) => Promise
- * @param {Function} props.onClose 收起回调
  * @param {boolean} props.saving 保存中
  */
-export function StrategyFieldsEditor({ strategy, onSave, onClose, saving }) {
+export function StrategyFieldsEditor({ strategy, onSave, saving }) {
   const toast = useToast();
   const [fields, setFields] = useState(() => (Array.isArray(strategy?.configSchema) ? strategy.configSchema.map((x) => ({ ...x })) : []));
   // 表单草稿：null=关闭；{ index:-1=新增 | 编辑下标, ... }
@@ -102,7 +101,6 @@ export function StrategyFieldsEditor({ strategy, onSave, onClose, saving }) {
         <span>
           <button onClick={startAdd} style={solidBtn('var(--dsw-alias-state-success-primary, #2e7d32)')}>+ 添加字段</button>
           <button onClick={saveAll} disabled={saving} style={solidBtn('var(--dsw-alias-state-business-primary, #1565c0)')}>{saving ? '保存中...' : '保存字段'}</button>
-          <button onClick={onClose} style={btnStyle}>收起</button>
         </span>
       </div>
 

src/client/views/StrategyTab.jsx

@@ -23,6 +23,7 @@ import { useMarket } from '../market/MarketDataProvider.jsx';
 import { PriceCell } from './PriceCell.jsx';
 import { ColumnSettingsPopover } from './ColumnSettingsPopover.jsx'; // 迭代11：列显隐设置
 import { FieldCellEditor } from './FieldCellEditor.jsx'; // 迭代11：自定义字段单元格点击编辑
+import { ExpandChevron } from './ExpandChevron.jsx'; // 行展开图标共享组件
 
 /** 价格格式化（2 位小数） */
 function fmtPrice(v) {
@@ -508,27 +509,7 @@ function StrategyTabInner({ strategyId, strategyName }) {
                     >
                       <td style={{ padding: '8px 6px', textAlign: 'center', width: 28 }}>
                         {hasHolding ? (
-                          <svg
-                            width="14"
-                            height="14"
-                            viewBox="0 0 14 14"
-                            style={{
-                              display: 'inline-block',
-                              transition: 'transform .15s ease',
-                              transform: isExpanded ? 'rotate(90deg)' : 'rotate(0deg)',
-                              color: 'var(--dsw-alias-state-success-primary, #2e7d32)',
-                              verticalAlign: 'middle',
-                            }}
-                          >
-                            <path
-                              d="M4.5 2.5 L9.5 7 L4.5 11.5"
-                              fill="none"
-                              stroke="currentColor"
-                              strokeWidth="2"
-                              strokeLinecap="round"
-                              strokeLinejoin="round"
-                            />
-                          </svg>
+                          <ExpandChevron expanded={isExpanded} />
                         ) : (
                           <span style={{ color: 'var(--dsw-alias-border-l3, #ccc)', fontSize: 10 }}>·</span>
                         )}

src/client/views/TradeRecordsTab.jsx

@@ -18,6 +18,7 @@
 import { useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import { useRpc } from './connection.jsx';
 import { LoadState } from './LoadState.jsx';
+import { ExpandChevron } from './ExpandChevron.jsx'; // 行展开图标共享组件
 import { RangeSelector } from './RangeSelector.jsx';
 
 const POLL_INTERVAL_MS = 4000; // 3-5s 轮询（取 4s）
@@ -411,28 +412,7 @@ function OrderRows({ order, expanded, onToggle, attributionCandidates, onLoadCan
       >
         <td style={{ ...tdStyle, textAlign: 'center', width: 28 }}>
         {hasTrades ? (
-          <svg
-            width="14"
-            height="14"
-            viewBox="0 0 14 14"
-            style={{
-              display: 'inline-block',
-              transition: 'transform .15s ease',
-              transform: expanded ? 'rotate(90deg)' : 'rotate(0deg)',
-              cursor: 'pointer',
-              color: 'var(--dsw-alias-state-success-primary, #2e7d32)',
-              verticalAlign: 'middle',
-            }}
-          >
-            <path
-              d="M4.5 2.5 L9.5 7 L4.5 11.5"
-              fill="none"
-              stroke="currentColor"
-              strokeWidth="2"
-              strokeLinecap="round"
-              strokeLinejoin="round"
-            />
-          </svg>
+          <ExpandChevron expanded={expanded} style={{ cursor: 'pointer' }} />
         ) : (
           <span style={{ color: 'var(--dsw-alias-border-l3, #ccc)', fontSize: 10 }}>·</span>
         )}