fix: verify-deposit blockchain verification and wallet-based auth

- Drop auth.users FK constraints for wallet-based authentication
- Fix deferrable unique constraint on blockchain_tx_hash (ON CONFLICT compat)
- Rewrite block search: HTTP RPC + blake2b instead of WS-only @pezkuwi/api
- Add blockNumber hint for faster verification of older transactions
- Normalize SS58/hex addresses via base58 for reliable comparison
- DepositModal captures approximate block number after tx submission

web/supabase/migrations/20260223130000_fix_tx_hash_constraint.sql

@@ -0,0 +1,18 @@
+-- Fix: Make blockchain_tx_hash unique constraint non-deferrable
+-- PostgreSQL ON CONFLICT does not support deferrable constraints as arbiters
+
+-- Drop the deferrable constraint (actual name from migration 016)
+ALTER TABLE public.p2p_deposit_withdraw_requests
+  DROP CONSTRAINT IF EXISTS p2p_deposit_withdraw_requests_tx_hash_unique;
+
+-- Also try the auto-generated name pattern
+ALTER TABLE public.p2p_deposit_withdraw_requests
+  DROP CONSTRAINT IF EXISTS unique_blockchain_tx_hash;
+
+-- Also try the default PostgreSQL naming convention
+ALTER TABLE public.p2p_deposit_withdraw_requests
+  DROP CONSTRAINT IF EXISTS p2p_deposit_withdraw_requests_blockchain_tx_hash_key;
+
+-- Recreate as non-deferrable (standard UNIQUE)
+ALTER TABLE public.p2p_deposit_withdraw_requests
+  ADD CONSTRAINT p2p_deposit_withdraw_requests_tx_hash_unique UNIQUE (blockchain_tx_hash);