Why is slot select not a multiselect dropdown?

**Is your feature request related to a problem? Please describe.**
If say you don't care if u get this subject from D1 or E1 slot, won't it be better to let you select both the slots in one go?

**Describe the solution you'd like**
use https://wds-shadcn-registry.netlify.app/components/multi-select/ or https://shadcn-multi-select-component.vercel.app/ to select multiple slots

**Additional context**

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首先定位当前的时段选择 UI，并跟踪所选时段如何传递到课表生成流程中。将其行为与所引用的两个多选示例进行比较，然后验证用户是否可以通过一次操作选择多个时段，以及生成的课表是否能在没有冲突的情况下处理这两项选择。

由索引模型根据 Issue 内容生成。