Constrain archived signature display height

src/pages/AftersalesDetail.tsx

@@ -337,7 +337,10 @@ function AftersalesDetailPage() {
               alt="客户确认签名"
               style={{
                 maxWidth: 480,
+                maxHeight: 220,
                 width: '100%',
+                height: 'auto',
+                objectFit: 'contain',
                 border: '1px solid #f0f0f0',
                 borderRadius: 6,
                 background: '#fff',

src/pages/styles/AftersalesConfirm.css

@@ -120,10 +120,12 @@
 
 .aftersales-signature-archived-img {
   max-width: 100%;
+  max-height: 220px;
   margin-top: 8px;
   border: 1px solid #e5e7eb;
   border-radius: 8px;
   background: #ffffff;
+  object-fit: contain;
 }
 
 .aftersales-actions {