Fix: Ignore SCIDs when creating full-length blinded paths

Previously, the `compact_paths` flag was only used to determine whether to
use a compact introduction node when creating compact blinded paths.

With the upcoming change to accept `MessageForwardNode` in
`create_blinded_paths`, there's a risk of SCIDs being passed (and used)
even when the user intends to create a full-length blinded path.

This patch updates the logic in `create_blinded_paths_from_iter` to
ignore SCIDs unless `compact_paths` is explicitly true—preserving correct
behavior for full-length blinded paths.

And while we are at it, we also update a minor article fix for
the DefaultMessageRouter, and Router documentation.

Author: shaavan

lightning/src/onion_message/messenger.rs

@@ -535,7 +535,7 @@ pub trait MessageRouter {
 /// # Privacy
 ///
 /// Creating [`BlindedMessagePath`]s may affect privacy since, if a suitable path cannot be found,
-/// it will create a one-hop path using the recipient as the introduction node if it is a announced
+/// it will create a one-hop path using the recipient as the introduction node if it is an announced
 /// node. Otherwise, there is no way to find a path to the introduction node in order to send a
 /// message, and thus an `Err` is returned.
 pub struct DefaultMessageRouter<G: Deref<Target = NetworkGraph<L>>, L: Deref, ES: Deref>
@@ -577,6 +577,10 @@ where
 
 		let has_one_peer = peers.len() == 1;
 		let mut peer_info = peers
+			.map(|peer| MessageForwardNode {
+				short_channel_id: if compact_paths { peer.short_channel_id } else { None },
+				..peer
+			})
 			// Limit to peers with announced channels unless the recipient is unannounced.
 			.filter_map(|peer| {
 				network_graph

lightning/src/routing/router.rs

@@ -53,7 +53,7 @@ pub use lightning_types::routing::{RouteHint, RouteHintHop};
 /// # Privacy
 ///
 /// Creating [`BlindedPaymentPath`]s may affect privacy since, if a suitable path cannot be found,
-/// it will create a one-hop path using the recipient as the introduction node if it is a announced
+/// it will create a one-hop path using the recipient as the introduction node if it is an announced
 /// node. Otherwise, there is no way to find a path to the introduction node in order to send a
 /// payment, and thus an `Err` is returned.
 pub struct DefaultRouter<