feat: implement and use standardized Skeleton component

frontend/src/components/ui/skeleton.rs

@@ -0,0 +1,13 @@
+use leptos::prelude::*;
+use tw_merge::tw_merge;
+
+#[component]
+pub fn Skeleton(
+    #[prop(optional, into)] class: String,
+) -> impl IntoView {
+    let class = tw_merge!(
+        "animate-pulse rounded-md bg-muted",
+        class
+    );
+    view! { <div class=class /> }
+}