feat: add Notifications switch to sidebar and implement robust push subscription logic

frontend/src/components/ui/switch.rs

@@ -0,0 +1,42 @@
+use leptos::prelude::*;
+use tailwind_fuse::tw_merge;
+
+#[component]
+pub fn Switch(
+    #[prop(into)] checked: Signal<bool>,
+    #[prop(into, optional)] on_checked_change: Option<Callback<bool>>,
+    #[prop(into, optional)] class: String,
+    #[prop(into, optional)] disabled: Signal<bool>,
+) -> impl IntoView {
+    let checked_val = move || checked.get();
+    let disabled_val = move || disabled.get();
+
+    let track_class = move || tw_merge!(
+        "inline-flex h-5 w-9 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50",
+        if checked_val() { "bg-primary" } else { "bg-input" },
+        class.clone()
+    );
+
+    let thumb_class = move || tw_merge!(
+        "pointer-events-none block h-4 w-4 rounded-full bg-background shadow-lg ring-0 transition-transform",
+        if checked_val() { "translate-x-4" } else { "translate-x-0" }
+    );
+
+    view! {
+        <button
+            type="button"
+            role="switch"
+            aria-checked=move || checked_val().to_string()
+            disabled=disabled_val
+            class=track_class
+            on:click=move |e| {
+                e.prevent_default();
+                if let Some(cb) = on_checked_change {
+                    cb.run(!checked_val());
+                }
+            }
+        >
+            <span class=thumb_class />
+        </button>
+    }
+}