Function NotesSide 

fn NotesSide(props: NotesSideProps) -> impl IntoView

左栏：筛选框、类型、笔记本与常用标签。窄屏只留筛选框与横排类型。

Required Props

• filter: [RwSignal<NoteFilter>]
• books: Vec<Notebook>
• stats: Option<NoteStats>