style: 调整多处页面UI细节与默认状态

1. 将动态页面默认视图从时间线模式改为非时间线模式
2. 修复分享按钮的默认样式问题，移除多余边框和背景
3. 调整登录页分隔线上下间距与微信登录按钮高度
4. 隐藏文章卡片的分类信息展示

src/components/uh-post-card/uh-post-card.vue

@@ -119,12 +119,14 @@ function handleToPostDetail() {
           <view class="line-clamp-1 text-[11px] text-gray-600">
             {{ timeFrom(post.spec.publishTime) }}
           </view>
-          <view class="shrink-0 text-xs text-gray-600">
-            ·
-          </view>
-          <view class="line-clamp-1 text-[11px] text-gray-600">
-            {{ post.categories.map(c => c.spec.displayName).join('·') }}
-          </view>
+          <template v-if="false">
+            <view class="shrink-0 text-xs text-gray-600">
+              ·
+            </view>
+            <view class="line-clamp-1 text-[11px] text-gray-600">
+              {{ post.categories.map(c => c.spec.displayName).join('·') }}
+            </view>
+          </template>
           <template v-if="props.type === 'topCover'">
             <view class="shrink-0 text-xs text-gray-600">
               ·