creatures keep their first corner, and characters never share files

- a creature walking a path no longer cuts its first corner: the path's first waypoint was dropped at decode (2342)
- two characters whose names differ only in accented or non-Latin letters no longer share macros, bindings and SavedVariables; a file that failed to load is not overwritten at logout (2342)
- custom chat channels survive a logout, a collapsed quest header keeps its quests watched, and a trackpad swipe scrolls as far as it adds up to (2342)
- a hearth off a zeppelin no longer lands back on its deck, and an opened lockbox with loot left in it unlocks (2342)
- every snapshot runs on Vulkan, in a container, before it ships (2344)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/benilla-ui/src/script/chat_window.rs

@@ -450,11 +450,6 @@ impl super::UiScript {
             .register_window_channel(window, name.to_string(), id)
     }
 
-    /// Host-side [`Model::strip_window_channel`] — the cascade's leave arm.
-    pub fn strip_chat_window_channel(&mut self, key: &str) -> bool {
-        self.model_mut().strip_window_channel(key)
-    }
-
     /// Seed the per-window looks from the host's persisted store — the load path, so it queues no
     /// change (an echo would re-dirty the file it was just read from; [`Self::set_cvar_host`]'s
     /// reason, one store over).