feat(calendar): add reminder functionality for events with notifications

server/routes/caldav.js

@@ -144,6 +144,15 @@ function eventToICS(event, base, user) {
   if (joinUrl) {
     lines.push(`X-REDLIGHT-JOIN-URL:${escapeICS(joinUrl)}`);
   }
+  if (event.reminder_minutes) {
+    lines.push(
+      'BEGIN:VALARM',
+      'ACTION:DISPLAY',
+      `DESCRIPTION:${escapeICS(event.title)}`,
+      `TRIGGER:-PT${event.reminder_minutes}M`,
+      'END:VALARM',
+    );
+  }
   lines.push('END:VEVENT', 'END:VCALENDAR');
   return lines.map(foldICSLine).join('\r\n');
 }