feat: 完善课程直播页面和首页Dashboard数据同步

- 修复6月17日单元小结归属问题，正确归入商业设计基础单元
- 添加单元海报功能，非直播状态显示单元海报图片
- 更新首页Dashboard开始上课和当日事项板块数据
- 实现课程数据与Dashboard数据自动同步
- 优化课程列表显示，包含完整100门课程数据

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

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

src/pages/Dashboard/index.jsx

@@ -3,7 +3,7 @@ import StartClass from "./components/StartClass";
 import QuickAccess from "./components/QuickAccess";
 import CalendarTaskModule from "./components/CalendarTaskModule";
 import StudyStatus from "./components/StudyStatus";
-import Rank from "@/components/Rank";
+import ClassRank from "@/components/ClassRank";
 import StageProgress from "@/components/StageProgress";
 import TaskList from "./components/TaskList";
 import { getDashboardStatistics } from "@/services";
@@ -52,38 +52,39 @@ const Dashboard = () => {
     <div className="dashboard">
       <StageProgress showBlockageAlert={true} />
 
-      <div className="dashboard-grid">
-        <StartClass
-          courses={dashboardData?.courses}
-          tasks={dashboardData?.tasks}
-          loading={loading}
-        />
-        <QuickAccess />
-        <CalendarTaskModule
-          tasks={dashboardData?.tasks?.allTasks}
-          selectedDate={selectedDate}
-          onDateChange={setSelectedDate}
-          loading={loading}
-        />
-        <StudyStatus
-          progress={dashboardData?.overview?.overallProgress}
-          loading={loading}
-        />
-        <Rank
-          data={
-            dashboardData?.ranking
-              ? {
-                  rankings: dashboardData.ranking.topStudents,
-                }
-              : null
-          }
-          loading={loading}
-        />
-        <TaskList
-          tasks={getTasksForDate(selectedDate)}
-          selectedDate={selectedDate}
-          loading={loading}
-        />
+      <div className="dashboard-wrapper">
+        <div className="dashboard-left-content">
+          <StartClass
+            courses={dashboardData?.courses}
+            tasks={dashboardData?.tasks}
+            loading={loading}
+          />
+          <QuickAccess />
+          <div className="status-rank-wrapper">
+            <StudyStatus
+              progress={dashboardData?.overview?.overallProgress}
+              loading={loading}
+            />
+            <ClassRank
+              className="class-rank-wrapper"
+              data={
+                dashboardData?.ranking
+                  ? {
+                      rankings: dashboardData.ranking.topStudents,
+                    }
+                  : null
+              }
+            />
+          </div>
+        </div>
+        <div className="dashboard-right-content">
+          <CalendarTaskModule
+            tasks={dashboardData?.tasks?.allTasks}
+            selectedDate={selectedDate}
+            onDateChange={setSelectedDate}
+          />
+          <TaskList tasks={getTasksForDate(selectedDate)} loading={loading} />
+        </div>
       </div>
     </div>
   );