feat: 优化书签转换逻辑和分类嵌套结构

templates/components/category.hbs

@@ -23,13 +23,17 @@
                     {{> category level=2}}
                 {{/each}}
             </div>
-        {{else if groups}}
+        {{/if}}
+        
+        {{#if groups}}
             <div class="groups-container" data-container="groups">
                 {{#each groups}}
                     {{> group}}
                 {{/each}}
             </div>
-        {{else if sites}}
+        {{/if}}
+        
+        {{#if sites}}
             <div class="sites-grid" data-container="sites">
                 {{#if sites.length}}
                     {{#each sites}}
@@ -39,8 +43,14 @@
                     <p class="empty-sites">暂无网站</p>
                 {{/if}}
             </div>
-        {{else}}
-            <p class="empty-content">暂无内容</p>
         {{/if}}
+        
+        {{#unless subcategories}}
+        {{#unless groups}}
+        {{#unless sites}}
+            <p class="empty-content">暂无内容</p>
+        {{/unless}}
+        {{/unless}}
+        {{/unless}}
     </div>
 </section>

templates/components/site-card.hbs

@@ -5,7 +5,7 @@
    data-name="{{name}}"
    data-url="{{url}}"
    data-icon="{{#if icon}}{{icon}}{{else}}fas fa-link{{/if}}"
-   data-description="{{#if description}}{{description}}{{else}}{{url}}{{/if}}">
+   data-description="{{#if description}}{{description}}{{else}}{{extractDomain url}}{{/if}}">
     {{#ifEquals @root.icons.mode "favicon"}}
       {{#ifHttpUrl url}}
         <div class="icon-container">
@@ -27,6 +27,6 @@
       <i class="{{#if icon}}{{icon}}{{else}}fas fa-link{{/if}}"></i>
     {{/ifEquals}}
     <h3>{{#if name}}{{name}}{{else}}未命名站点{{/if}}</h3>
-    <p>{{#if description}}{{description}}{{else}}{{url}}{{/if}}</p>
+    <p>{{#if description}}{{description}}{{else}}{{extractDomain url}}{{/if}}</p>
 </a>
 {{/if}}