Add toast notification system: implement useToast composable and ToastContainer component

app/composables/useToast.ts

@@ -0,0 +1,30 @@
+type Toast = {
+	id: number
+	message: string
+	type?: "success" | "error" | "info"
+}
+
+const toasts = ref<Toast[]>([])
+
+export const useToast = () => {
+	const show = (
+		message: string,
+		type: Toast["type"] = "info",
+		duration = 5 * 1000
+	): number => {
+		const id = toasts.value.length + 1
+		toasts.value.push({ id, message, type })
+
+		setTimeout(() => {
+			remove(id)
+		}, duration)
+
+		return id
+	}
+
+	const remove = (id: number) => {
+		toasts.value = toasts.value.filter((t) => t.id != id)
+	}
+
+	return { toasts, show, remove }
+}

app/ui/ToastContainer.vue

@@ -0,0 +1,77 @@
+<script setup lang="ts">
+const { toasts, remove } = useToast()
+</script>
+
+<template>
+	<div class="toast-container">
+		<TransitionGroup name="toast">
+			<div
+				v-for="toast in toasts"
+				:key="toast.id"
+				class="toast"
+				:class="[toast.type]"
+				@click="remove(toast.id)"
+			>
+				{{ toast.message }}
+			</div>
+		</TransitionGroup>
+	</div>
+</template>
+
+<style lang="scss" scoped>
+@use "@/styles/variables" as *;
+
+.toast-container {
+	position: fixed;
+	bottom: 0;
+	right: 0;
+	z-index: 100;
+
+	padding: 20px;
+
+	display: flex;
+	flex-direction: column;
+	gap: 10px;
+}
+
+.toast {
+	background-color: $color-background;
+	border: 1px solid $color-border;
+	border-radius: $standard-border-radius;
+
+	padding: 10px 16px;
+	min-width: 200px;
+
+	cursor: pointer;
+
+	transition: transform 0.2s ease, opacity 0.2s ease;
+}
+
+.toast-enter-from {
+	opacity: 0;
+	transform: translateX(50px);
+}
+
+.toast-enter-active {
+	transition: all 0.3s ease-out;
+}
+
+.toast-enter-to {
+	opacity: 1;
+	transform: translateX(0);
+}
+
+.toast-leave-from {
+	opacity: 1;
+	transform: translateX(0);
+}
+
+.toast-leave-active {
+	transition: all 0.3s ease-out;
+}
+
+.toast-leave-to {
+	opacity: 0;
+	transform: translateX(50px);
+}
+</style>