fix(client): 财务汇总往来搜索改为表头下拉框形态（验收反馈）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

design/prototype/screens/finance.html

@@ -28,9 +28,11 @@
   .sec-head{display:flex; align-items:baseline; gap:10px; margin:0 0 12px;}
   .sec-head h2{margin:0; font-size:var(--fs-h2); color:var(--heading); font-weight:700;}
   .sec-head .sh-sub{font-size:var(--fs-xs); color:var(--muted);}
-  /* 汇总卡头部往来单位搜索（即时本地过滤，非 combo 单选） */
-  .sec-head .sum-search{margin-left:auto; width:220px; align-self:center;}
   .block{margin-bottom:22px;}
+  /* 汇总表「往来单位」列头内嵌搜索下拉（对齐 ComboSearchField：combo 原子
+     + openSearchMenu 弹层，单选精确匹配一行，非关键字子串过滤） */
+  .th-party-wrap{display:flex; align-items:center; gap:10px;}
+  .th-party-wrap .combo{height:34px; width:180px; flex:none;}
 
   /* ====== 新增原子：条形图 .barchart / .bar ====== */
   .chart-card{background:var(--surface); border:1px solid var(--border); border-radius:var(--r-lg); padding:18px 20px 14px; transition:background-color .28s,border-color .28s;}
@@ -110,11 +112,12 @@
 
       <!-- 4. 应收/应付 汇总表 -->
       <div class="block">
-        <div class="sec-head"><h2>应收 / 应付 汇总</h2><span class="sh-sub">按往来单位 · 点击行查看流水</span>
-          <div class="searchbox sum-search"><svg viewBox="0 0 24 24"><use href="#i-search"/></svg><input id="sumSearch" placeholder="搜索往来单位…" oninput="sumKw=this.value; buildSummary();"></div>
-        </div>
+        <div class="sec-head"><h2>应收 / 应付 汇总</h2><span class="sh-sub">按往来单位 · 点击行查看流水</span></div>
         <div class="table"><table>
-          <thead><tr><th>往来单位</th><th class="num">应收</th><th class="num">应付</th><th class="num">净额</th><th class="act">操作</th></tr></thead>
+          <thead><tr>
+            <th><div class="th-party-wrap"><span>往来单位</span><div class="combo" id="sumPartyCombo" onclick="openSumPartyFilter(this)"><input id="sumPartyInput" readonly placeholder="搜索往来单位…"><span class="caf" id="sumPartyCaf" onclick="sumPartyCafClick(event)"><svg viewBox="0 0 24 24" stroke-width="2"><use href="#i-chevron-down"/></svg></span></div></div></th>
+            <th class="num">应收</th><th class="num">应付</th><th class="num">净额</th><th class="act">操作</th>
+          </tr></thead>
           <tbody id="sumBody"></tbody>
         </table></div>
       </div>
@@ -185,11 +188,27 @@ const SUMMARY=[
   {name:'川渝糖酒集团',recv:0,pay:60400}
 ];
 function yuan(n){ return '¥'+n.toLocaleString(); }
-// 汇总卡「往来单位」搜索：本地即时过滤（数据已全量加载，非服务端分页，搜索口径=显示口径）
-let sumKw='';
+// 汇总表头「往来单位」下拉筛选（对齐 ComboSearchField：单选精确匹配一行，非
+// 关键字子串过滤；候选=当前汇总行往来单位，搜索口径=显示口径，不用全量往来
+// 单位库，避免选到无余额单位出空表）
+let sumPartyId=null; // 选中的 SUMMARY 下标；null=全部
+function openSumPartyFilter(t){
+  openSearchMenu(t, SUMMARY.map((s,i)=>({v:i,label:s.name,sel:i===sumPartyId})), v=>{
+    sumPartyId=Number(v); closeMenus(); buildSummary();
+  }, {placeholder:'搜索往来单位…'});
+}
+// combo 已选中值（.has）时，点击右侧图标（此时为 ×）清除，不弹出下拉
+function sumPartyCafClick(e){
+  if(sumPartyId!=null){ e.stopPropagation(); sumPartyId=null; buildSummary(); }
+}
 function buildSummary(){
-  const q=sumKw.trim().toLowerCase();
-  const rows=SUMMARY.map((s,i)=>({...s,i})).filter(s=>!q||s.name.toLowerCase().includes(q));
+  const rows=sumPartyId==null?SUMMARY.map((s,i)=>({...s,i})):SUMMARY.map((s,i)=>({...s,i})).filter(s=>s.i===sumPartyId);
+  const has=sumPartyId!=null;
+  document.getElementById('sumPartyCombo').classList.toggle('has',has);
+  document.getElementById('sumPartyInput').value=has?SUMMARY[sumPartyId].name:'';
+  document.getElementById('sumPartyCaf').innerHTML=has
+    ?'<svg viewBox="0 0 24 24" stroke-width="2"><use href="#i-close"/></svg>'
+    :'<svg viewBox="0 0 24 24" stroke-width="2"><use href="#i-chevron-down"/></svg>';
   document.getElementById('sumBody').innerHTML=rows.length?rows.map(s=>{
     const net=s.recv-s.pay;
     const netCls=net>0?'net-pos':(net<0?'net-neg':'');