added notification toasts (error modals still broken)

internal/view/component/popup/toastContainer.templ

@@ -0,0 +1,10 @@
+package popup
+
+// ToastContainer displays stacked toast notifications (success, warning, info)
+templ ToastContainer() {
+	<div class="fixed top-20 right-5 z-40 flex flex-col gap-3 max-w-sm pointer-events-none">
+		<template x-for="toast in toasts" :key="toast.id">
+			@ToastNotification()
+		</template>
+	</div>
+}