已新增儲存和載入設定功能。「儲存設定」按鈕會將所有特殊條件匯出為JSON檔案，「載入設定」按鈕可以匯入之前儲存的設定檔，讓您在不同裝置間輕鬆同步特殊條件。這些按鈕設計得很低調，維持隱蔽性，且檔案會自動命名包含日期以便管理。

Good, I can see the constraints already have the "allowed columns" feature. Now let me update the entire theme to a TEAM TAIWAN baseball style. I'll update the color scheme, imagery, and overall aesthetic.

Now update the main page with the TEAM TAIWAN baseball theme:

Now update the classroom grid with the baseball theme:

Now update the confetti effect with baseball-themed celebration:

Now update the student form and student list to match the blue/red baseball theme:

Now update the export button to match the new theme:

Now update the export image template colors too:

Finally, update the layout metadata:

整體風格已全面更換為 TEAM TAIWAN 世界經典棒球賽的加油主題。色調改為經典的深藍 x 紅 x 白配色，背景使用深藍色球場氛圍搭配棒球縫線裝飾元素，標題旁加上棒球圖示，並有「TEAM TAIWAN - We Are Champions」和「全力以赴 為台灣加油」標語。慶祝特效也改為棒球場全壘打風格的藍紅白金煙火效果。