Replace dropdowns with combobox (searchbar + select) whereever needed

**Is your feature request related to a problem? Please describe.**
Currently u have to search for a faculty by scrolling through the list

**Describe the solution you'd like**
Instead of select dropdown use https://ui.shadcn.com/docs/components/combobox combobox to search for and then select the faculty etc

**Additional context**

Example of replacement:

首先在前端中定位 faculty 下拉框和其他选择下拉框，然后将它们的行为与链接的 shadcn combobox 示例进行比较。替换相关下拉框，使用户可以搜索并选择 faculty 条目；当预期的选择器支持搜索和选择，而无需滚动浏览完整列表时，即表示完成。

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