fix: 修复文件夹过滤时分页总数计算错误

- 新建文件夹按钮移到类别右侧（文件夹+图标）
- 默认折叠状态，点击类别名称展开/折叠
- 投影箭头指示展开状态（▶折叠，▼展开）
- 按钮hover时显示绿色背景，更明显可见

xian_favor/api.py

@@ -55,7 +55,8 @@ def list_items():
         status=request.args.get('status'),
         tag=request.args.get('tag'),
         keyword=request.args.get('keyword'),
-        starred=starred
+        starred=starred,
+        folder_id=folder_id
     )
     
     return jsonify({'success': True, 'data': items, 'total': total})
@@ -929,12 +930,49 @@ INDEX_TEMPLATE = '''
             opacity: 0.8;
         }
         
-        /* 文件夹列表样式 */
+        /* 文件夹列表样式 - 折叠式 */
-        .sidebar-section .section-header { font-weight: 500; }
+        .sidebar-section { margin-bottom: 2px; }
+        .sidebar-section .section-header {
+            font-weight: 500;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+            padding-right: 10px;
+        }
+        .sidebar-section .section-header .header-left {
+            display: flex;
+            align-items: center;
+            flex: 1;
+        }
+        .sidebar-section .section-header .toggle-arrow {
+            font-size: 10px;
+            margin-right: 8px;
+            transition: transform 0.2s;
+        }
+        .sidebar-section.expanded .section-header .toggle-arrow {
+            transform: rotate(90deg);
+        }
+        .sidebar-section .section-header .new-folder-btn {
+            font-size: 14px;
+            color: #adb5bd;
+            cursor: pointer;
+            padding: 2px 6px;
+            border-radius: 4px;
+            transition: all 0.2s;
+            background: rgba(255,255,255,0.1);
+        }
+        .sidebar-section .section-header .new-folder-btn:hover {
+            color: #fff;
+            background: #28a745;
+        }
         .folder-list { 
             padding-left: 10px; 
-            max-height: 150px; 
+            max-height: 200px; 
             overflow-y: auto;
+            display: none;  /* 默认隐藏 */
+        }
+        .sidebar-section.expanded .folder-list {
+            display: block;  /* 展开时显示 */
         }
         .folder-list a { 
             padding: 6px 20px; 
@@ -1041,31 +1079,59 @@ INDEX_TEMPLATE = '''
                 <a href="#" data-filter="starred"><i class="bi bi-star-fill" style="color:#ffc107;"></i> 重点关注</a>
                 
                 <!-- 文本类别 -->
-                <div class="sidebar-section">
+                <div class="sidebar-section" id="section-text">
-                    <a href="#" data-filter="text" class="section-header"><i class="bi bi-file-text"></i> 文本</a>
+                    <a href="#" class="section-header" onclick="toggleSection('text'); return false;">
+                        <span class="header-left">
+                            <span class="toggle-arrow"><i class="bi bi-chevron-right"></i></span>
+                            <i class="bi bi-file-text"></i> 文本
+                        </span>
+                        <span class="new-folder-btn" onclick="event.stopPropagation(); showNewFolderModal('text'); return false;">
+                            <i class="bi bi-folder-plus"></i>
+                        </span>
+                    </a>
                     <div class="folder-list" id="folderList-text"></div>
-                    <a href="#" class="folder-action" onclick="showNewFolderModal('text'); return false;"><i class="bi bi-folder-plus"></i> 新建文件夹</a>
                 </div>
                 
                 <!-- 链接类别 -->
-                <div class="sidebar-section">
+                <div class="sidebar-section" id="section-link">
-                    <a href="#" data-filter="link" class="section-header"><i class="bi bi-link-45deg"></i> 链接</a>
+                    <a href="#" class="section-header" onclick="toggleSection('link'); return false;">
+                        <span class="header-left">
+                            <span class="toggle-arrow"><i class="bi bi-chevron-right"></i></span>
+                            <i class="bi bi-link-45deg"></i> 链接
+                        </span>
+                        <span class="new-folder-btn" onclick="event.stopPropagation(); showNewFolderModal('link'); return false;">
+                            <i class="bi bi-folder-plus"></i>
+                        </span>
+                    </a>
                     <div class="folder-list" id="folderList-link"></div>
-                    <a href="#" class="folder-action" onclick="showNewFolderModal('link'); return false;"><i class="bi bi-folder-plus"></i> 新建文件夹</a>
                 </div>
                 
                 <!-- 专栏类别 -->
-                <div class="sidebar-section">
+                <div class="sidebar-section" id="section-column">
-                    <a href="#" data-filter="column" class="section-header"><i class="bi bi-newspaper"></i> 专栏</a>
+                    <a href="#" class="section-header" onclick="toggleSection('column'); return false;">
+                        <span class="header-left">
+                            <span class="toggle-arrow"><i class="bi bi-chevron-right"></i></span>
+                            <i class="bi bi-newspaper"></i> 专栏
+                        </span>
+                        <span class="new-folder-btn" onclick="event.stopPropagation(); showNewFolderModal('column'); return false;">
+                            <i class="bi bi-folder-plus"></i>
+                        </span>
+                    </a>
                     <div class="folder-list" id="folderList-column"></div>
-                    <a href="#" class="folder-action" onclick="showNewFolderModal('column'); return false;"><i class="bi bi-folder-plus"></i> 新建文件夹</a>
                 </div>
                 
                 <!-- 待办类别 -->
-                <div class="sidebar-section">
+                <div class="sidebar-section" id="section-todo">
-                    <a href="#" data-filter="todo" class="section-header"><i class="bi bi-check2-square"></i> 待办</a>
+                    <a href="#" class="section-header" onclick="toggleSection('todo'); return false;">
+                        <span class="header-left">
+                            <span class="toggle-arrow"><i class="bi bi-chevron-right"></i></span>
+                            <i class="bi bi-check2-square"></i> 待办
+                        </span>
+                        <span class="new-folder-btn" onclick="event.stopPropagation(); showNewFolderModal('todo'); return false;">
+                            <i class="bi bi-folder-plus"></i>
+                        </span>
+                    </a>
                     <div class="folder-list" id="folderList-todo"></div>
-                    <a href="#" class="folder-action" onclick="showNewFolderModal('todo'); return false;"><i class="bi bi-folder-plus"></i> 新建文件夹</a>
                 </div>
                 
                 <hr class="border-secondary">
@@ -3375,15 +3441,20 @@ async function loadFolders() {
 
 function renderFolderList(type) {
     const container = document.getElementById(`folderList-${type}`);
+    const section = document.getElementById(`section-${type}`);
     if (!container) return;
     
     const folders = allFolders[type] || [];
     
     if (folders.length === 0) {
         container.innerHTML = '';
+        if (section) section.classList.remove('expanded');
         return;
     }
     
+    // 默认不展开，保持折叠状态
+    // if (section) section.classList.add('expanded');  // 已移除
+    
     container.innerHTML = folders.map(f => `
         <a href="#" data-folder="${f.id}" onclick="filterByFolder('${type}', ${f.id}); return false;">
             <i class="bi bi-folder"></i> ${f.name} <small class="text-muted">(${f.item_count || 0})</small>
@@ -3391,6 +3462,24 @@ function renderFolderList(type) {
     `).join('');
 }
 
+// 切换文件夹区域展开/折叠
+// 切换文件夹区域展开/折叠，并过滤显示该类别数据
+function toggleSection(type) {
+    const section = document.getElementById(`section-${type}`);
+    if (!section) return;
+    
+    // 切换展开状态
+    section.classList.toggle('expanded');
+    
+    // 更新侧边栏选中状态
+    document.querySelectorAll('.sidebar a').forEach(a => a.classList.remove('active'));
+    section.querySelector('.section-header').classList.add('active');
+    
+    // 设置过滤条件：只过滤类型，不限制文件夹
+    currentFilter = { type, status: '', starred: null, folder_id: null };
+    loadItems(1);
+}
+
 async function showNewFolderModal(type) {
     // 离线检查
     if (!checkOnlineBeforeAction('新建文件夹')) return;

xian_favor/db.py

@@ -326,7 +326,7 @@ class Database:
             return items
     
     def count_items(self, type: str = None, status: str = None, tag: str = None,
-                    keyword: str = None, starred: bool = None) -> int:
+                    keyword: str = None, starred: bool = None, folder_id: int = None) -> int:
         """计算符合条件的条目总数"""
         with self.get_conn() as conn:
             cursor = conn.cursor()
@@ -358,6 +358,15 @@ class Database:
                 keyword_pattern = f"%{keyword}%"
                 params.extend([keyword_pattern, keyword_pattern, keyword_pattern])
             
+            # 文件夹过滤
+            if folder_id is not None:
+                if folder_id == -1:
+                    # 未分类：folder_id为NULL
+                    conditions.append("i.folder_id IS NULL")
+                else:
+                    conditions.append("i.folder_id = ?")
+                    params.append(folder_id)
+            
             if conditions:
                 query += " WHERE " + " AND ".join(conditions)