feat: 更新训练计划和今日训练页面

- 在训练计划中添加了新的类型定义，优化了排课功能
- 修改了今日训练页面的布局，提升用户体验
- 删除了不再使用的排课相关文件，简化代码结构
- 更新了 Redux 状态管理，确保数据处理的准确性和稳定性

store/workoutSlice.ts

@@ -227,8 +227,10 @@ const workoutSlice = createSlice({
       })
       .addCase(loadTodayWorkout.fulfilled, (state, action) => {
         state.loading = false;
-        state.currentSession = action.payload;
-        state.exercises = action.payload.exercises || [];
+        if (action.payload) {
+          state.currentSession = action.payload;
+          state.exercises = action.payload.exercises || [];
+        }
       })
       .addCase(loadTodayWorkout.rejected, (state, action) => {
         state.loading = false;
@@ -372,14 +374,14 @@ const workoutSlice = createSlice({
       .addCase(deleteWorkoutSession.fulfilled, (state, action) => {
         state.loading = false;
         const deletedSessionId = action.payload;
-        
+
         // 如果删除的是当前会话，清空当前会话数据
         if (state.currentSession?.id === deletedSessionId) {
           state.currentSession = null;
           state.exercises = [];
           state.stats = null;
         }
-        
+
         // 从会话列表中移除已删除的会话
         state.sessions = state.sessions.filter(session => session.id !== deletedSessionId);
       })
@@ -391,5 +393,5 @@ const workoutSlice = createSlice({
 });
 
 export const { clearWorkoutError, clearCurrentWorkout, updateExerciseLocally } = workoutSlice.actions;
-export { addWorkoutExercise, deleteWorkoutSession };
+
 export default workoutSlice.reducer;