fix: correct cancel_reason column name to cancellation_reason

Also add migration to drop remaining auth.users FK constraints
on p2p_messages, notifications, ratings, audit_log tables.

shared/lib/p2p-fiat.ts

@@ -888,7 +888,7 @@ export async function cancelTrade(
       .update({
         status: 'cancelled',
         cancelled_by: cancelledBy,
-        cancel_reason: reason,
+        cancellation_reason: reason,
       })
       .eq('id', tradeId);
 

web/supabase/migrations/20260224050000_drop_remaining_auth_fk.sql

@@ -0,0 +1,31 @@
+-- Migration: Drop remaining auth.users FK constraints missed in 20260223120000
+-- These tables still reference auth.users(id) but use wallet-based UUID v5 identity
+
+-- 1. p2p_messages.sender_id (blocks chat)
+ALTER TABLE public.p2p_messages
+  DROP CONSTRAINT IF EXISTS p2p_messages_sender_id_fkey;
+
+-- 2. p2p_notifications.user_id (blocks notifications)
+DO $$ BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'p2p_notifications') THEN
+    ALTER TABLE public.p2p_notifications DROP CONSTRAINT IF EXISTS p2p_notifications_user_id_fkey;
+  END IF;
+END $$;
+
+-- 3. p2p_ratings.rater_id, rated_id
+DO $$ BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'p2p_ratings') THEN
+    ALTER TABLE public.p2p_ratings DROP CONSTRAINT IF EXISTS p2p_ratings_rater_id_fkey;
+    ALTER TABLE public.p2p_ratings DROP CONSTRAINT IF EXISTS p2p_ratings_rated_id_fkey;
+  END IF;
+END $$;
+
+-- 4. p2p_audit_log.user_id
+DO $$ BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'p2p_audit_log') THEN
+    ALTER TABLE public.p2p_audit_log DROP CONSTRAINT IF EXISTS p2p_audit_log_user_id_fkey;
+  END IF;
+END $$;
+
+-- 5. Drop old auth.uid() RLS policy on p2p_messages (replaced by open policy)
+DROP POLICY IF EXISTS "p2p_messages_trade_participants" ON public.p2p_messages;