feat: wire admin workflows to real APIs

src/apps/client/ClientSignaturesPage.tsx

@@ -154,7 +154,7 @@ function SignatureForm({ signature }: { signature?: SignatureItem }) {
 export function ClientSignaturesPage() {
   const [signatures, setSignatures] = useState(initialSignatures);
   const [keyword, setKeyword] = useState('');
-  const [expandedId, setExpandedId] = useState('sig-1');
+  const [expandedId, setExpandedId] = useState('');
   const [signatureModal, setSignatureModal] = useState<{ mode: 'add' | 'edit'; signature?: SignatureItem } | null>(null);
   const [editingDrainage, setEditingDrainage] = useState<{ signature: SignatureItem; drainage?: DrainageInfo } | null>(null);
 
@@ -228,7 +228,7 @@ export function ClientSignaturesPage() {
                 </div>
                 <div className="signature-actions">
                   <Button icon={<Edit3 size={16} />} onClick={() => setSignatureModal({ mode: 'edit', signature })} size="sm" variant="ghost">编辑</Button>
-                  <Button icon={<Trash2 size={16} />} onClick={() => deleteSignature(signature.id)} size="sm" variant="ghost">删除</Button>
+                  <Button icon={<Trash2 size={16} />} onClick={() => deleteSignature(signature.id)} size="sm" variant="danger">删除</Button>
                 </div>
               </div>
 
@@ -254,8 +254,8 @@ export function ClientSignaturesPage() {
                         <Tag tone={statusToneMap[item.telecom]}>{statusLabelMap[item.telecom]}</Tag>
                         <span className="muted">{item.submittedAt}</span>
                         <span className="drainage-row-actions">
-                          <button onClick={() => setEditingDrainage({ signature, drainage: item })} type="button">编辑</button>
-                          <button onClick={() => deleteDrainage(signature.id, item.id)} type="button">删除</button>
+                          <Button onClick={() => setEditingDrainage({ signature, drainage: item })} size="sm" variant="ghost">编辑</Button>
+                          <Button onClick={() => deleteDrainage(signature.id, item.id)} size="sm" variant="danger">删除</Button>
                         </span>
                       </div>
                     ))}