make return type for closure explicit

src/components/sidebar.rs

@@ -51,7 +51,7 @@ pub fn Sidebar () -> impl IntoView {
     };
 
 
-    let pc_hp = move |a: u16, b: u16| {
+    let pc_hp = move |a: u16, b: u16| -> String {
         format!("width: {}%", utils::filled_pc(a, b).min(100.))
     };