Server stacks carry their lore to clients

A stack's minecraft:lore (as loaded, or as a server mod wrote it into
StackData.other) is now sent in its component patch, so a native mod's
menu items show lines under their name (prices, changes) in a stock
client.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/horizon-client/src/lan/guest.rs

@@ -1040,6 +1040,16 @@ fn network_stack(
             horizon_protocol::item::Component::Text(name.clone()),
         ));
     }
+    // Lore lines as loaded or as a server mod wrote them (a list of text
+    // components), so a server menu's items can say more than their name.
+    if let Some(horizon_world::nbt::Tag::List(lines)) =
+        s.data().and_then(|d| d.other("minecraft:lore"))
+    {
+        stack.added.push((
+            horizon_protocol::item::component::LORE,
+            horizon_protocol::item::Component::Lore(lines.clone()),
+        ));
+    }
     // The component as loaded, so a translatable name stays one.
     if let Some(name) = s.data().and_then(|d| d.other("minecraft:item_name")) {
         stack.added.push((
@@ -1141,6 +1151,32 @@ mod tests {
     use horizon_protocol::item::{Component, component};
     use horizon_world::nbt::Tag;
 
+    #[test]
+    fn lore_lines_reach_the_client() {
+        let lines = vec![
+            Tag::compound([("text", Tag::String("Buy 400".into()))]),
+            Tag::compound([
+                ("text", Tag::String("▲ 2.0%".into())),
+                ("color", Tag::String("green".into())),
+            ]),
+        ];
+        let mut item = ItemStack::new("minecraft:diamond", 1);
+        item.data_mut()
+            .other
+            .push(("minecraft:lore".into(), Tag::List(lines.clone())));
+        let sent = stack_to_network(|_| 7, |_, _| None, &Some(item));
+        let mut writer = Writer::new();
+        horizon_protocol::item::Slot::write(&sent, &mut writer);
+        let mut reader = Reader::new(&writer.data);
+        let received = horizon_protocol::item::Slot::read(&mut reader)
+            .unwrap()
+            .unwrap();
+        assert_eq!(
+            received.component(component::LORE),
+            Some(&Component::Lore(lines))
+        );
+    }
+
     #[test]
     fn styled_custom_name_survives_inventory_sync() {
         let name = Tag::compound([