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/20260131232838_add_catchup_reminders.sql

@@ -0,0 +1,27 @@
+-- Catchup reminder tracking table
+CREATE TABLE IF NOT EXISTS catchup_reminder_tracking (
+    user_id UUID PRIMARY KEY REFERENCES profiles(id) ON DELETE CASCADE,
+    pending_since TIMESTAMPTZ,
+    last_reminder_sent_at TIMESTAMPTZ,
+    reminder_count INTEGER NOT NULL DEFAULT 0
+);
+
+-- Enable RLS (service role only)
+ALTER TABLE catchup_reminder_tracking ENABLE ROW LEVEL SECURITY;
+
+-- Add preference toggle for catchup reminders
+ALTER TABLE notification_preferences
+ADD COLUMN IF NOT EXISTS catchup_reminders_enabled BOOLEAN DEFAULT true;
+
+-- Schedule daily cron job at 17:00 UTC to send catchup reminders
+SELECT cron.schedule(
+    'send-catchup-reminders',
+    '0 17 * * *',
+    $$
+    SELECT net.http_post(
+        url := 'https://ckjcrkjpmhqhiucifukx.supabase.co/functions/v1/send-catchup-reminder',
+        headers := jsonb_build_object('Content-Type', 'application/json'),
+        body := '{}'::jsonb
+    )
+    $$
+);