fix: calendar newlines, admin delivery window setting

CalDAV: joins were using literal '\n' strings which icalEscape then
double-escaped the backslash, so calendar entries showed raw \n. Now
joins use real newline chars which icalEscape converts correctly.

Added deliveryWindowMinutes to HoursConfig (default 60 min). The
checkout route reads this at request time to set both the Square
deliveryWindowDuration and the customer email arrival window. Admin
hours page now has a number input to configure it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

estore/src/app/admin/page.tsx

@@ -281,6 +281,26 @@ function HoursEditor() {
         </div>
       ))}
 
+      <div style={{ marginBottom: '1.5rem' }}>
+        <label style={{ fontWeight: 600, fontSize: '0.85rem', display: 'block', marginBottom: '0.4rem' }}>
+          Delivery arrival window (minutes)
+        </label>
+        <p style={{ fontSize: '0.78rem', color: '#888', marginBottom: '0.5rem' }}>
+          How long the customer&apos;s arrival window is — shown on their confirmation email and sent to Square.
+        </p>
+        <input
+          type="number"
+          className="input is-small"
+          min={15}
+          max={480}
+          step={15}
+          value={config.deliveryWindowMinutes ?? 60}
+          onChange={(e) => setConfig((prev) => prev ? { ...prev, deliveryWindowMinutes: Math.max(15, parseInt(e.target.value) || 60) } : prev)}
+          style={{ width: 100 }}
+        />
+        <span style={{ marginLeft: 8, fontSize: '0.82rem', color: '#666' }}>min</span>
+      </div>
+
       <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
         <button
           className={`button is-dark is-small${saving ? ' is-loading' : ''}`}

estore/src/app/api/checkout/route.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { createHash } from 'crypto'
 import { inferTier, JOB_MINUTES, type DeliveryTier } from '@/lib/delivery'
+import { getHoursConfig } from '@/lib/hours'
 
 interface LineItem {
   name:           string
@@ -98,11 +99,12 @@ export async function POST(req: NextRequest) {
       ? deliveryTier
       : inferTier(lineItems.map((l) => l.name))
 
-  const arrivalISO = deliverySlotISO
+  const arrivalISO          = deliverySlotISO
-  const jobMin     = JOB_MINUTES[resolvedTier]
+  const jobMin              = JOB_MINUTES[resolvedTier]  // calendar event duration (internal)
-  const windowDurationStr = deliverySlotISO
+  const windowMin           = getHoursConfig().deliveryWindowMinutes  // customer-facing window
-    ? `PT${Math.floor(jobMin / 60) > 0 ? `${Math.floor(jobMin / 60)}H` : ''}${jobMin % 60 > 0 ? `${jobMin % 60}M` : ''}`
+  const toIsoDuration = (m: number) =>
-    : undefined
+    `PT${Math.floor(m / 60) > 0 ? `${Math.floor(m / 60)}H` : ''}${m % 60 > 0 ? `${m % 60}M` : ''}`
+  const windowDurationStr   = deliverySlotISO ? toIsoDuration(windowMin) : undefined
 
   const fmtSlot = (iso: string) =>
     new Date(iso).toLocaleString('en-US', { timeZone: 'America/New_York', dateStyle: 'medium', timeStyle: 'short' })
@@ -386,10 +388,9 @@ export async function POST(req: NextRequest) {
     if (!captured) throw new Error('Payment capture returned no result')
 
     // ── Fire-and-forget: emails only (calendar already written above) ────────
-    const subtotalCents      = lineItems.reduce((sum, li) => sum + li.priceCents * li.quantity, 0)
+    const subtotalCents = lineItems.reduce((sum, li) => sum + li.priceCents * li.quantity, 0)
-    const CUSTOMER_WINDOW_MIN = 60  // 1-hour arrival window shown to customer
     const slotEndISO    = deliverySlotISO
-      ? new Date(new Date(deliverySlotISO).getTime() + CUSTOMER_WINDOW_MIN * 60_000).toISOString()
+      ? new Date(new Date(deliverySlotISO).getTime() + windowMin * 60_000).toISOString()
       : undefined
 
     void (async () => {

estore/src/lib/caldav.ts

@@ -108,8 +108,8 @@ function buildItemLines(lineItems: CalendarLineItem[]): string {
     if (li.modifiers?.length) parts.push(`  ${li.modifiers.map((m) => m.name).join(', ')}`)
     if (li.colors?.length)    parts.push(`  Colors: ${li.colors.join(', ')}`)
     if (li.note)              parts.push(`  Note: ${li.note}`)
-    return parts.join('\\n')
+    return parts.join('\n')
-  }).join('\\n')
+  }).join('\n')
 }
 
 export async function createDeliveryEvent(params: {
@@ -143,7 +143,7 @@ export async function createDeliveryEvent(params: {
     '',
     `Order: ${orderId}`,
     `Drive: ~${driveMinutes} min each way`,
-  ].filter((p) => p !== null).join('\\n')
+  ].filter((p) => p !== null).join('\n')
 
   const ical = [
     'BEGIN:VCALENDAR',
@@ -204,7 +204,7 @@ export async function createPickupEvent(params: {
     notes ? `Notes: ${notes}` : null,
     '',
     `Order: ${orderId}`,
-  ].filter((p) => p !== null).join('\\n')
+  ].filter((p) => p !== null).join('\n')
 
   const ical = [
     'BEGIN:VCALENDAR',

estore/src/lib/hours-config.ts

@@ -8,11 +8,13 @@ export interface DayHours {
 export type WeekHours = Record<string, DayHours | null>   // keys '0'–'6'
 
 export interface HoursConfig {
-  delivery: WeekHours
+  delivery:              WeekHours
-  pickup:   WeekHours
+  pickup:                WeekHours
+  deliveryWindowMinutes: number   // customer-facing arrival window (email + Square)
 }
 
 export const DEFAULT_HOURS: HoursConfig = {
+  deliveryWindowMinutes: 60,
   delivery: {
     '0': { open:  480, close: 1020 },  // Sun  8:00 AM –  5:00 PM
     '1': null,                          // Mon  closed

estore/src/lib/hours.ts

@@ -14,8 +14,9 @@ export function getHoursConfig(): HoursConfig {
   try {
     const saved = JSON.parse(readFileSync(HOURS_PATH, 'utf-8')) as Partial<HoursConfig>
     return {
-      delivery: { ...DEFAULT_HOURS.delivery, ...(saved.delivery ?? {}) },
+      delivery:              { ...DEFAULT_HOURS.delivery, ...(saved.delivery ?? {}) },
-      pickup:   { ...DEFAULT_HOURS.pickup,   ...(saved.pickup   ?? {}) },
+      pickup:                { ...DEFAULT_HOURS.pickup,   ...(saved.pickup   ?? {}) },
+      deliveryWindowMinutes: saved.deliveryWindowMinutes ?? DEFAULT_HOURS.deliveryWindowMinutes,
     }
   } catch {
     return DEFAULT_HOURS