chore: fix cargo clippy warnings (unused import and false positive unused_mut)

src/router.rs

@@ -22,7 +22,7 @@ use crate::pages::post_detail::PostDetail;
 use crate::pages::register::Register;
 use crate::pages::search::Search;
 use crate::pages::tags::{TagDetail, Tags};
-use crate::theme::{use_theme_provider, Theme, ThemePreload};
+use crate::theme::{use_theme_provider, ThemePreload};
 
 /// 全站路由枚举，每个变体对应一个页面路径
 #[derive(Clone, Routable, Debug, PartialEq)]

src/theme.rs

@@ -160,6 +160,7 @@ pub fn ThemeToggle() -> Element {
     let mut theme = use_theme();
     // generation:每次点击递增。延迟回调检查自己的 gen 是否最新,过期则跳过 set。
     // 解决连续点击时多个 spawn_local 堆积导致的状态错乱。
+    #[allow(unused_mut)]
     let mut click_gen = use_signal(|| 0u32);
 
     rsx! {