feat: 更新样式，调整按钮的填充属性以提升界面一致性

src/views/issue/issuing-apply/issue-period.vue

@@ -228,14 +228,14 @@ function handleSubmit(values: GenericObject) {
         </ion-button>
       </ui-collapse>
 
-      <ion-button expand="block" color="tertiary" fill="outline" @click="push({ ...initialIssuePeriod })">
+      <ion-button expand="block" fill="outline" @click="push({ ...initialIssuePeriod })">
         <ion-icon slot="icon-only" :icon="addOutline" />
         <span>{{ t('asset.issue.apply.addStep') }}</span>
       </ion-button>
     </FieldArray>
 
     <div class="flex justify-center space-x-4">
-      <ion-button expand="block" shape="round" class="w-40" @click="$router.back()">
+      <ion-button expand="block" shape="round" fill="outline" class="w-40" @click="$router.back()">
         {{ t('asset.issue.apply.back') }}
       </ion-button>
       <ion-button expand="block" type="submit" class="w-full" shape="round" color="success">