Implemented e-mail notification trigger.

pages/admin/emails/@template/+Page.vue

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+<script setup>
+import { inject } from 'vue';
+
+import Admin from '#/components/admin/admin.vue';
+
+const { pageProps } = inject('pageContext');
+
+const {
+	template,
+	html,
+	text,
+	error,
+} = pageProps;
+</script>
+
+<template>
+	<Admin class="page">
+		<div class="header">
+			<h2 class="heading">{{ template }}</h2>
+		</div>
+
+		<p v-if="error" class="error">Failed to render template: {{ error }}</p>
+
+		<template v-else>
+			<iframe
+				:srcdoc="html"
+				class="frame"
+				title="E-mail preview"
+			/>
+
+			<details v-if="text" class="text">
+				<summary>Plain-text version</summary>
+				<pre>{{ text }}</pre>
+			</details>
+		</template>
+	</Admin>
+</template>
+
+<style scoped>
+.header {
+	display: flex;
+	align-items: baseline;
+	gap: 1rem;
+	margin-bottom: 1rem;
+}
+
+.error {
+	color: var(--warn);
+	font-weight: bold;
+}
+
+.frame {
+	width: 100%;
+	min-height: 60rem;
+	border: solid 1px var(--shadow-weak-30);
+	border-radius: .5rem;
+	background: #fff;
+}
+
+.text {
+	margin-top: 1rem;
+
+	pre {
+		white-space: pre-wrap;
+		padding: 1rem;
+		background: var(--background-dark-20);
+		border-radius: .5rem;
+	}
+}
+</style>

pages/admin/emails/@template/+onBeforeRender.js

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+import { render } from 'vike/abort';
+
+import { emailTemplates, listEmailTemplates } from '#/src/email-templates.js';
+
+export default async function onBeforeRender(pageContext) {
+	if (!pageContext.user || pageContext.user.role === 'user') {
+		throw render(404);
+	}
+
+	const { template } = pageContext.routeParams;
+
+	if (!listEmailTemplates().includes(template)) {
+		throw render(404);
+	}
+
+	let html = null;
+	let text = null;
+	let error = null;
+
+	try {
+		({ html, text } = await emailTemplates.render(`${template}.vue`));
+	}
+	catch (renderError) {
+		error = renderError.message;
+	}
+
+	return {
+		pageContext: {
+			title: `E-mail Preview: ${template}`,
+			pageProps: {
+				template,
+				html,
+				text,
+				error,
+			},
+		},
+	};
+}

pages/admin/emails/@template/+route.js

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+import { match } from 'path-to-regexp';
+
+const path = '/admin/emails/:template';
+const urlMatch = match(path, { decode: decodeURIComponent });
+
+export default (pageContext) => {
+	const matched = urlMatch(pageContext.urlPathname);
+
+	if (matched) {
+		return {
+			routeParams: {
+				template: matched.params.template,
+			},
+		};
+	}
+
+	return false;
+};