feat: 作业页面单元分类导航和样式优化

- 为复合能力课和垂直能力课添加单元分组结构
- 实现单元导航栏和课程筛选功能
- 优化导航栏样式，采用胶囊式设计
- 调整页面布局和间距，提升视觉体验
- 修复营销能力课日历事件显示问题
- 修复1v1规划时间为14:00-16:00
- 修复作业页面iframe返回后滚动失效问题

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/Sidebar/index.css

@@ -64,6 +64,24 @@
         font-size: 12px;
         color: #86909c;
       }
+      .graduate-badge {
+        display: inline-block;
+        padding: 3px 10px;
+        background: transparent;
+        color: #667eea;
+        font-size: 12px;
+        font-weight: 600;
+        border-radius: 14px;
+        margin-top: 4px;
+        border: 2px solid #667eea;
+        letter-spacing: 0.5px;
+        transition: all 0.3s ease;
+      }
+      .graduate-badge:hover {
+        background: rgba(102, 126, 234, 0.08);
+        transform: translateY(-1px);
+        box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
+      }
     }
   }
   .visitor-count {

src/components/Sidebar/index.jsx

@@ -41,7 +41,7 @@ const Sidebar = ({ isCollapsed, setIsCollapsed }) => {
         {isCollapsed && (
           <div className="user-info">
             <span className="user-name">{studentInfo?.realName}</span>
-            <span className="user-id">学号：{studentInfo?.id}</span>
+            <span className="graduate-badge">毕业生</span>
           </div>
         )}
       </div>