feat: 审批流程改为时间轴样式，增加审批人/抄送人标识

- 审批流程使用时间轴样式显示
- 增加"审批人"和"抄送人"标签
- 已审批节点显示审批人姓名和审批时间
- 未审批节点显示节点名称（人名）
- 当前审批节点高亮显示

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/approval/detail.tsx

@@ -331,11 +331,15 @@ export default function ApprovalDetail() {
         {/* 当前审批节点 */}
         {detail.status === 'pending' && currentApprovers.length > 0 && (
           <Card title="当前审批" className={styles.section}>
-            {currentApprovers.map((item, index) => (
-              <div key={index} className={styles.approverItem}>
-                <div className={styles.approverName}>{getNodeApproversNames(item.nodeId, item.nodeType)}</div>
-              </div>
-            ))}
+            {currentApprovers.map((item, index) => {
+              const typeLabel = item.nodeType === 'notify' ? '抄送人' : '审批人'
+              return (
+                <div key={index} className={styles.approverItem}>
+                  <span className={styles.approverType}>{typeLabel}</span>
+                  <span className={styles.approverName}>{getNodeApproversNames(item.nodeId, item.nodeType)}</span>
+                </div>
+              )
+            })}
           </Card>
         )}
 
@@ -364,31 +368,50 @@ export default function ApprovalDetail() {
         {/* 审批流程 */}
         {detail.flow?.nodes && detail.flow.nodes.length > 0 && (
           <Card title="审批流程" className={styles.section}>
-            <div className={styles.flowNodes}>
+            <div className={styles.timeline}>
               {detail.flow.nodes.map((node, index) => {
                 const isCurrent = detail.current_nodes?.includes(node.id)
-                const record = detail.records.find((r) => r.node_id === node.id)
+                const records = detail.records.filter(r => r.node_id === node.id && r.action !== 'submit')
+                const hasApproved = records.length > 0
 
-                let status: 'pending' | 'done' = 'pending'
-                if (record) {
-                  status = 'done'
+                // 判断节点状态
+                let nodeStatus: 'pending' | 'done' = 'pending'
+                if (hasApproved) {
+                  nodeStatus = 'done'
                 } else if (!isCurrent && index > 0) {
-                  // 检查前面的节点是否完成
                   const prevNode = detail.flow.nodes[index - 1]
                   const prevRecord = detail.records.find((r) => r.node_id === prevNode.id)
-                  if (prevRecord) status = 'done'
+                  if (prevRecord) nodeStatus = 'done'
+                }
+
+                // 获取节点类型标签
+                const typeLabel = node.type === 'notify' ? '抄送人' : '审批人'
+
+                // 获取显示名称和审批时间
+                let displayName = node.name || '待定'
+                let approvalTime = ''
+
+                if (hasApproved && records[0]) {
+                  displayName = records[0].approver?.name || displayName
+                  approvalTime = formatTime(records[0].created_at)
                 }
 
                 return (
-                  <div
-                    key={node.id}
-                    className={`${styles.flowNode} ${styles[status]} ${isCurrent ? styles.current : ''}`}
-                  >
-                    <div className={styles.flowNodeDot}>
-                      {status === 'done' ? '✓' : index + 1}
+                  <div key={node.id} className={styles.timelineItem}>
+                    <div className={`${styles.timelineDot} ${nodeStatus === 'done' ? styles.done : ''} ${isCurrent ? styles.current : ''}`}>
+                      {nodeStatus === 'done' ? '✓' : index + 1}
                     </div>
-                    <div className={styles.flowNodeContent}>
-                      <div className={styles.flowNodeName}>{getNodeDisplayName(node)}</div>
+                    <div className={styles.timelineContent}>
+                      <div className={styles.timelineTitle}>
+                        <span className={styles.timelineType}>{typeLabel}</span>
+                        <span className={styles.timelineName}>{displayName}</span>
+                      </div>
+                      {approvalTime && (
+                        <div className={styles.timelineTime}>{approvalTime}</div>
+                      )}
+                      {hasApproved && records[0]?.comment && (
+                        <div className={styles.timelineComment}>备注: {records[0].comment}</div>
+                      )}
                     </div>
                   </div>
                 )