Improve filters for Teacher, Room, and Subject selection

## Description
Currently, filtering teachers, rooms, and subjects in the timetable UI is limited. Enhancing the filter functionality will allow users to quickly search and select the desired teacher, room, or subject, improving usability and efficiency.

## Steps to Implement
1. Add search or autocomplete functionality in the filter dropdowns.
2. Allow users to select multiple options where applicable.
3. Update the timetable view dynamically based on selected filters.

## Expected Behavior
- Users can easily search and filter teachers, rooms, or subjects.
- Timetable updates in real-time according to the selected filters.

尋找課表 UI 元件，它們可能位於 frontend 目錄中。找到 Teacher、Room 和 Subject 的篩選下拉選單。研究如何新增搜尋/autocomplete（例如使用函式庫或自訂輸入框）以及多選功能。檢查課表檢視目前如何更新，並確保篩選器會觸發動態更新。選取篩選條件並確認課表有所變更，以進行測試。

由索引模型根據 Issue 內容生成。