feat: Guest import, RSVP reminders — 7ead7758 scope additions

CSV/Excel Import:
- POST /api/events/:id/guests/import (multer memory storage, max 5MB)
- Accepts .csv and .xlsx/.xls via xlsx + csv-parse/sync
- Handles Hebrew column names and English column names interchangeably
- Phone normalization (domain expert spec): strips spaces/hyphens/parens,
  handles 05X-XXXXXXX → +972..., +972... passthrough, 972... → +972...
  Invalid phone → guest imported with phone=null, warning recorded
- Unknown dietary_preference → 'none'; unknown relationship_group → 'other'
- Bulk insert in transaction (all-or-nothing), max 500 rows
- Returns: { imported, skipped, warnings, details } with per-row reasons
- UTF-8 BOM handled on CSV parse (Excel exports)

RSVP Reminder Cron:
- jobs/reminderCron.js: node-cron, daily at 09:00 Asia/Jerusalem
- Queries guests with rsvp_status=pending where event is 7 or 2 days away
- Regenerates wa.me reminder deep-link with urgency text (עוד שבוע / עוד 2 ימים)
- Updates invitations.whatsapp_link in-place
- No auto-send (MVP): organizer clicks link manually
- Started automatically in server.js app.listen callback

GET /api/events/:id/guests/reminders:
- Returns pending guests who have whatsapp_link set (reminder generated by cron)
- Organizer uses this to surface the Pending Reminders panel

Frontend additions:
- ImportGuestsForm component: file picker, POST multipart, shows import summary
  with per-row skipped/warning details
- PendingRemindersPanel component: orange card listing pending guests with
  wa.me reminder links; hides itself when no reminders
- GuestListPage: integrated both components, refreshTrigger propagates to
  reminders panel after any add/import/delete/status-change

Build: 0 TS errors, 62 modules transformed

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

jobs/reminderCron.js

@@ -0,0 +1,82 @@
+/**
+ * RSVP Reminder Cron Job
+ *
+ * Runs daily at 09:00 Asia/Jerusalem.
+ * Finds events at 7-day and 2-day thresholds with pending guests.
+ * Updates invitations.whatsapp_link with a fresh wa.me reminder deep-link.
+ * Organizer clicks the link manually (no auto-send in MVP).
+ */
+
+const cron = require('node-cron');
+const pool = require('../db/pool');
+
+const BASE_URL = process.env.APP_BASE_URL || 'http://localhost:3000';
+
+function buildReminderWhatsAppLink(phone, eventTitle, rsvpUrl, daysUntilEvent) {
+  if (!phone) return null;
+  const phoneDigits = phone.replace('+', '');
+  const urgency = daysUntilEvent <= 2 ? 'עוד 2 ימים' : 'עוד שבוע';
+  const message = encodeURIComponent(
+    `תזכורת: ${urgency} לאירוע "${eventTitle}". אנא אשר/י הגעה: ${rsvpUrl}`
+  );
+  return `https://wa.me/${phoneDigits}?text=${message}`;
+}
+
+async function generateReminders() {
+  console.log('[ReminderCron] Running RSVP reminder generation…');
+
+  try {
+    // Find pending guests whose event is 7 or 2 days from now (±12h window for daily run)
+    const { rows } = await pool.query(`
+      SELECT
+        g.id          AS guest_id,
+        g.name_hebrew,
+        g.phone,
+        e.id          AS event_id,
+        e.title,
+        e.event_date,
+        i.token,
+        EXTRACT(DAY FROM (e.event_date::date - CURRENT_DATE)) AS days_until
+      FROM guests g
+      JOIN events e ON e.id = g.event_id
+      JOIN invitations i ON i.guest_id = g.id
+      WHERE g.rsvp_status = 'pending'
+        AND e.deleted_at IS NULL
+        AND e.event_date > NOW()
+        AND EXTRACT(DAY FROM (e.event_date::date - CURRENT_DATE)) IN (7, 2)
+    `);
+
+    if (rows.length === 0) {
+      console.log('[ReminderCron] No pending reminders due today.');
+      return;
+    }
+
+    for (const row of rows) {
+      const rsvpUrl = `${BASE_URL}/rsvp/${row.token}`;
+      const whatsappLink = buildReminderWhatsAppLink(
+        row.phone, row.title, rsvpUrl, parseInt(row.days_until)
+      );
+
+      if (whatsappLink) {
+        await pool.query(
+          'UPDATE invitations SET whatsapp_link = $1 WHERE token = $2',
+          [whatsappLink, row.token]
+        );
+      }
+    }
+
+    console.log(`[ReminderCron] Updated ${rows.length} pending reminder links.`);
+  } catch (err) {
+    console.error('[ReminderCron] Error:', err.message);
+  }
+}
+
+function startReminderCron() {
+  // 09:00 every day, Asia/Jerusalem timezone
+  cron.schedule('0 9 * * *', generateReminders, {
+    timezone: 'Asia/Jerusalem',
+  });
+  console.log('[ReminderCron] Scheduled: daily at 09:00 Asia/Jerusalem');
+}
+
+module.exports = { startReminderCron, generateReminders };