Add email notifications and sync dashboard

src/mailer.js

@@ -55,6 +55,45 @@ function getTransporter() {
   return cachedTransporter;
 }
 
+function escapeHtml(value) {
+  return String(value ?? '')
+    .replaceAll('&', '&')
+    .replaceAll('<', '&lt;')
+    .replaceAll('>', '&gt;')
+    .replaceAll('"', '&quot;');
+}
+
+function normalizeBody(body) {
+  if (Array.isArray(body)) {
+    return body
+      .map((line) => String(line ?? '').trim())
+      .filter(Boolean);
+  }
+
+  const text = String(body ?? '').trim();
+  return text ? [text] : [];
+}
+
+function buildNotificationEmailText(body, buttonText, buttonUrl) {
+  const lines = normalizeBody(body);
+  if (buttonUrl) {
+    lines.push(`${buttonText || 'Открыть'}: ${buttonUrl}`);
+  }
+  return lines.join('\n');
+}
+
+function buildNotificationEmailHtml(body, buttonText, buttonUrl) {
+  const paragraphs = normalizeBody(body)
+    .map((line) => `<p>${escapeHtml(line)}</p>`)
+    .join('');
+
+  if (!buttonUrl) {
+    return paragraphs;
+  }
+
+  return `${paragraphs}<p><a href="${escapeHtml(buttonUrl)}" style="display:inline-block;padding:12px 18px;border-radius:999px;background:#123824;color:#ffffff;text-decoration:none;font-weight:700;">${escapeHtml(buttonText || 'Открыть')}</a></p>`;
+}
+
 export async function sendLoginCodeEmail({ to, code, expiresAt }) {
   const { from } = getSmtpConfig();
   const transporter = getTransporter();
@@ -68,3 +107,16 @@ export async function sendLoginCodeEmail({ to, code, expiresAt }) {
     html: template.html,
   });
 }
+
+export async function sendNotificationEmail({ to, subject, body, buttonText = null, buttonUrl = null }) {
+  const { from } = getSmtpConfig();
+  const transporter = getTransporter();
+
+  await transporter.sendMail({
+    from,
+    to,
+    subject,
+    text: buildNotificationEmailText(body, buttonText, buttonUrl),
+    html: buildNotificationEmailHtml(body, buttonText, buttonUrl),
+  });
+}