Use BDK events in update_payment_store instead of scanning all transactions

Replace the full transaction list scan in `update_payment_store` with
handling of BDK's `WalletEvent` stream during sync. This leverages the
new events in BDK 2.2, reduces redundant work, and prepares the
foundation for reliable RBF/CPFP tracking via `WalletEvent::TxReplaced`.

Author: Camillarhi

bindings/ldk_node.udl

@@ -420,7 +420,7 @@ interface ClosureReason {
 
 [Enum]
 interface PaymentKind {
-	Onchain(Txid txid, ConfirmationStatus status);
+	Onchain(Txid txid, ConfirmationStatus status, sequence<Txid> conflicting_txids);
 	Bolt11(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret);
 	Bolt11Jit(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret, u64? counterparty_skimmed_fee_msat, LSPFeeLimits lsp_fee_limits);
 	Bolt12Offer(PaymentHash? hash, PaymentPreimage? preimage, PaymentSecret? secret, OfferId offer_id, UntrustedString? payer_note, u64? quantity);

src/payment/store.rs

@@ -291,6 +291,15 @@ impl StorableObject for PaymentDetails {
 			}
 		}
 
+		if let Some(conflicting_txids_opt) = &update.conflicting_txids {
+			match self.kind {
+				PaymentKind::Onchain { ref mut conflicting_txids, .. } => {
+					update_if_necessary!(*conflicting_txids, conflicting_txids_opt.to_vec());
+				},
+				_ => {},
+			}
+		}
+
 		if updated {
 			self.latest_update_timestamp = SystemTime::now()
 				.duration_since(UNIX_EPOCH)
@@ -351,6 +360,8 @@ pub enum PaymentKind {
 		txid: Txid,
 		/// The confirmation status of this payment.
 		status: ConfirmationStatus,
+		/// Transaction IDs that have replaced or conflict with this payment.
+		conflicting_txids: Vec<Txid>,
 	},
 	/// A [BOLT 11] payment.
 	///
@@ -448,6 +459,7 @@ pub enum PaymentKind {
 impl_writeable_tlv_based_enum!(PaymentKind,
 	(0, Onchain) => {
 		(0, txid, required),
+		(1, conflicting_txids, optional_vec),
 		(2, status, required),
 	},
 	(2, Bolt11) => {
@@ -540,6 +552,7 @@ pub(crate) struct PaymentDetailsUpdate {
 	pub direction: Option<PaymentDirection>,
 	pub status: Option<PaymentStatus>,
 	pub confirmation_status: Option<ConfirmationStatus>,
+	pub conflicting_txids: Option<Vec<Txid>>,
 }
 
 impl PaymentDetailsUpdate {
@@ -555,6 +568,7 @@ impl PaymentDetailsUpdate {
 			direction: None,
 			status: None,
 			confirmation_status: None,
+			conflicting_txids: None,
 		}
 	}
 }
@@ -570,9 +584,11 @@ impl From<&PaymentDetails> for PaymentDetailsUpdate {
 			_ => (None, None, None),
 		};
 
-		let confirmation_status = match value.kind {
-			PaymentKind::Onchain { status, .. } => Some(status),
-			_ => None,
+		let (confirmation_status, conflicting_txids) = match &value.kind {
+			PaymentKind::Onchain { status, conflicting_txids, .. } => {
+				(Some(*status), conflicting_txids.clone())
+			},
+			_ => (None, Vec::new()),
 		};
 
 		let counterparty_skimmed_fee_msat = match value.kind {
@@ -593,6 +609,7 @@ impl From<&PaymentDetails> for PaymentDetailsUpdate {
 			direction: Some(value.direction),
 			status: Some(value.status),
 			confirmation_status,
+			conflicting_txids: Some(conflicting_txids),
 		}
 	}
 }