feat: 更新合同内容样式，添加最大高度和滚动条，优化用户体验

src/assets/css/public/contract.css

 .sign-contract-content {
+  max-height: 500px;
+  overflow-y: auto;
   color: #000;
 }
 .sign-contract-content .title h2 {

src/assets/css/public/contract.less

 .sign-contract-content {
+    max-height: 500px;
+    overflow-y: auto;
     color: #000;
 
     .title {

src/views/OrderTrack/goodsDetail.vue

@@ -293,7 +293,7 @@
       </div>
       <div slot="footer" class="dialog-footer">
         <el-button @click="closeSignDialog">取消</el-button>
-        <el-button type="primary" @click="submitSignContract">确认签署</el-button>
+        <el-button type="primary" @click="submitSignContract" :disabled="disabled">确认签署</el-button>
       </div>
     </el-dialog>
 
@@ -330,7 +330,8 @@ export default {
         oss_file_id: ''
       },
       signDialogVisible: false,
-      signContractData: []
+      signContractData: {},
+      disabled: true
     };
   },
   created() {
@@ -467,4 +468,13 @@ export default {
 <style scoped>
 @import "../../assets/css/goods/goods.min.css";
 @import "../../assets/css/public/contract.css";
+
+.el-button--primary.is-disabled,
+.el-button--primary.is-disabled:active,
+.el-button--primary.is-disabled:focus,
+.el-button--primary.is-disabled:hover {
+  color: #FFF !important;
+  background-color: #a0cfff !important;
+  border-color: #a0cfff !important;
+}
 </style>
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