SMS body includes date, time, and a short link to the booking detail page

An SMS that says "Your booking is confirmed" without the date, time, or a link to details forces the customer to open the app or website to find out when they need to show up. That friction is not cosmetic — customers forward confirmation SMSes to themselves as reminders, screenshot them, and share them with family. A generic message provides none of that utility. TCPA (47 U.S.C. § 227) requires an identification element in transactional SMS; a booking-specific link with a token also serves the dual purpose of providing one-click access to reschedule or cancel. A login-required URL collapses that utility for customers who are not currently authenticated.

Update the SMS template in src/lib/sms-templates.ts to include all three required elements — date/time, timezone, and a short token-based link under 50 characters:

export function confirmationSmsTemplate(booking: Booking) {
  const date = formatDate(booking.start_time, 'MMM d, h:mm a')
  const tz = booking.timezone ?? 'UTC'
  const link = `https://yoursite.com/b/${booking.short_id}` // ≤ 50 chars
  return `Booking confirmed: ${date} ${tz}. Details: ${link}`
}

Verify the link target handles unauthenticated access via the short_id token — it must not redirect to a login page.