fix: 明确退回原因并启用退回操作

src/components/xingbang/ReviewerWorkspace.tsx

@@ -20,6 +20,7 @@ function valueText(value:any){
 
 export default function ReviewerWorkspace({topics,reviewed,blocking,busy,opinion,setOpinion,onDecision,onComplete,hasRun}:any){
   const total=topics.length;
+  const [returnReason,setReturnReason]=useState("");
   const issues=topics.filter((item:any)=>item.ai_status==="issue").length;
   const incomplete=topics.filter((item:any)=>["missing","not_run"].includes(item.ai_status)).length;
   const pending=topics.filter((item:any)=>!item.decision).map((item:any)=>item.title);
@@ -31,7 +32,7 @@ export default function ReviewerWorkspace({topics,reviewed,blocking,busy,opinion
     <div className="xb-review-lanes" aria-hidden="true"><span><Database size={15}/>数据与来源</span><span><ShieldAlert size={15}/>AI辅助判断</span><span><CheckCircle2 size={15}/>评审员结论</span></div>
     <div className="xb-topic-list">{topics.map((topic:any)=><ReviewTopic key={topic.id} topic={topic} busy={busy} opinion={opinion} onDecision={onDecision}/>)}</div>
     {!hasRun&&<div className="xb-review-hint"><CircleDashed size={18}/><span>请先在页面上方发起一次独立评审，系统才会冻结本次数据与规则版本。</span></div>}
-    <div className="xb-review-final"><div><CheckCircle2 size={21}/><span><b>完成全链路核查</b><small>{pending.length?`待确认：${pending.join("、")}`:blocking.length?`尚未闭环：${blocking.map((item:any)=>item.title).join("、")}`:"所有必审领域均已形成可追溯结论"}</small></span></div><button className="ra-button" disabled={busy||!hasRun} onClick={()=>onComplete("退回")}>退回补充材料</button><button className="ra-button primary" disabled={busy||!canApprove} onClick={()=>onComplete("批准")}>批准并生成评审报告</button></div>
+    <div className="xb-review-final"><div><CheckCircle2 size={21}/><span><b>完成全链路核查</b><small>{pending.length?`待确认：${pending.join("、")}`:blocking.length?`尚未闭环：${blocking.map((item:any)=>item.title).join("、")}`:"所有必审领域均已形成可追溯结论"}</small></span></div><label className="xb-return-reason"><span>退回原因（退回时必填）</span><textarea aria-label="退回补充材料原因" value={returnReason} maxLength={2000} onChange={(event)=>setReturnReason(event.target.value)} placeholder="例如：请补充最新银行流水并说明回款口径"/></label><button className="ra-button" title={!hasRun?"请先完成独立评审":!returnReason.trim()?"请先填写退回原因":"退回客户经理补充材料"} disabled={busy||!hasRun||!returnReason.trim()} onClick={()=>onComplete("退回",returnReason.trim())}>退回补充材料</button><button className="ra-button primary" disabled={busy||!canApprove} onClick={()=>onComplete("批准")}>批准并生成评审报告</button></div>
   </section>;
 }