0.3.1: drop ToastPacket — client-only imports broke server-side load

ToastPacket imported net.minecraft.client.gui.components.toasts.* and
net.minecraft.client.Minecraft at class scope. When BnsNetwork.onRegister
Payloads referenced ToastPacket::handle on the dedicated server,
NoClassDefFoundError fired (the client-only classes don't exist on
the dedicated server side).

Toast feedback wasn't load-bearing — KubeJS already chat-prints the
result of every /bns verb. Players see "Sold 8x diamond for 60 spurs"
in the chat as before, and the screens re-render off the snapshot
the bridge pushes after each routed verb.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gradle.properties

@@ -19,5 +19,5 @@ loader_version_range=[1,)
 mod_id=bnstoolkit
 mod_name=Brass and Sigil Toolkit
 mod_license=All Rights Reserved
-mod_version=0.3.0
+mod_version=0.3.1
 mod_group_id=uk.sijbers.bnstoolkit