feat: add catchup and unpaired reminder notifications

Add automatic push notifications for behind partners (escalating: 24h then
every 3 days) and daily unpaired user reminders. Includes edge functions,
migrations, notification preference toggles, and UI improvements to pairing
and swipe screens.

apps/supabase/migrations/20260131231008_add_unpaired_reminders.sql

@@ -0,0 +1,20 @@
+-- Add tracking column for unpaired reminder rate limiting
+ALTER TABLE profiles
+ADD COLUMN IF NOT EXISTS last_unpaired_reminder_at TIMESTAMPTZ;
+
+-- Add preference toggle for unpaired reminders
+ALTER TABLE notification_preferences
+ADD COLUMN IF NOT EXISTS unpaired_reminders_enabled BOOLEAN DEFAULT true;
+
+-- Schedule daily cron job at 18:00 UTC to send unpaired reminders
+SELECT cron.schedule(
+    'send-unpaired-reminders',
+    '0 18 * * *',
+    $$
+    SELECT net.http_post(
+        url := 'https://ckjcrkjpmhqhiucifukx.supabase.co/functions/v1/send-unpaired-reminder',
+        headers := jsonb_build_object('Content-Type', 'application/json'),
+        body := '{}'::jsonb
+    )
+    $$
+);