fix: show expand control for locked post preview

uniapp/src/packages_community/pages/post_detail.vue

@@ -72,6 +72,7 @@
                                 {{ postPreview.summary }}
                             </text>
                             <text v-if="previewCanExpand" class="detail-post-card__expand"
+                                :class="{ 'detail-post-card__expand--collapsed': !previewExpanded }"
                                 @tap="previewExpanded = !previewExpanded">
                                 {{ previewExpanded ? '收起' : '展开' }}
                             </text>
@@ -464,6 +465,7 @@ const bilingualBlocks = computed(() => {
 })
 const hasBilingualContent = computed(() => bilingualBlocks.value.length > 0)
 const previewCanExpand = computed(() => {
+    if (post.value?.is_locked) return true
     if (hasBilingualContent.value) return bilingualBlocks.value.length > 1
 
     const summary = postPreview.value.summary
@@ -1111,6 +1113,15 @@ const formatCommentTime = (value: any) => {
         color: #1468f5;
         font-size: 27rpx;
         white-space: nowrap;
+
+        &--collapsed {
+            position: absolute;
+            right: 0;
+            bottom: 0;
+            margin-left: 0;
+            padding-left: 38rpx;
+            background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, #ffffff 38%);
+        }
     }
 
     &__bilingual {