the mailbox takes typing again, and events carry their real arguments

- the mail window's send tab takes typing again: the subject, body and money boxes were taking no input while the recipient box swallowed every key, and a sent letter clears its subject and item icon instead of putting them straight back (2145)
- seven events fire the way the reference does: UNIT_DYNAMIC_FLAGS fires at all, swapping two identical stacks between bank slots fires PLAYERBANKSLOTS_CHANGED twice, the pet sheet's training points repaint, and ITEM_LOCK_CHANGED loses its invented arguments (2140)
- nine widget methods 1.12 addons probe for are in: ShaguTweaks stops recolouring textures the reference leaves alone, pfUI and _Nameplates stop raising on a tooltip's GetAnchorType, and 63 AceEvent addons get RegisterAllEvents (2142)
- six post-1.12 methods leave the widget surface (SetSize, SetShown, HasFocus, SetFormattedText and two tooltip verbs), so an addon reaching for a later client's API finds what a real 1.12 client gives it (2142, 2146)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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

@@ -15,7 +15,7 @@
 
 use mlua::{Lua, Value};
 
-use super::binding_abi::{number_arg, predicate};
+use super::binding_abi::{flag, number_arg};
 use super::Model;
 
 /// `FlagTutorial`'s clamp: `0 ≤ n − 1 < 0x32` — the fifty ids `GlobalStrings.lua` names.
@@ -57,7 +57,7 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
                 .tutorial_bank
                 .as_ref()
                 .is_some_and(|b| b.iter().any(|&byte| byte != 0xFF));
-            Ok(predicate(enabled))
+            Ok(flag(enabled))
         })?,
     )?;