feat: Update UUID generation to v7 for item stacks

Updated the `ItemStack` constructor to use `Uuid().v7()` for generating default item IDs instead of `v4()`. This change leverages the time-based nature of UUIDv7 for potentially better performance and ordering.

A minor syntax update was also made in `lib/ui/game/campfire/campfire.dart` to use a cascade operator for `BorderRadius`.

Author: liplum

lib/core/item/item.dart

@@ -359,7 +359,7 @@ class ItemStack with ExtraMixin implements JConvertibleProtocol {
 
   int get stackMass => mass ?? meta.mass;
 
-  ItemStack(this.meta, {int? id, this.mass}) : id = id ?? const Uuid().v4().hashCode;
+  ItemStack(this.meta, {int? id, this.mass}) : id = id ?? const Uuid().v7().hashCode;
 
   String displayName() => meta.l10nName();
 

lib/ui/game/campfire/campfire.dart

@@ -490,7 +490,7 @@ class _DynamicCampfireImageState extends AnimatedWidgetBaseState<DynamicCampfire
 
   @override
   Widget build(BuildContext context) {
-    return ClipRRect(borderRadius: const BorderRadius.all(Radius.circular(8)), child: buildBar());
+    return ClipRRect(borderRadius: const .all(.circular(8)), child: buildBar());
   }
 
   Widget buildBar() {