plate text settles, mobs stop sinking, and select goes with Lua 5.1

- a nameplate's name and level stop popping a pixel every other step as the plate slides, and the whole plate no longer jumps 19 px to the top of the screen on a rounding tie; the chat bubble takes the same fix (2172)
- creatures and other players stop sinking through the ground while the world is still streaming in, where a Stormwind patroller had been 31 yd under its street: a body our world cannot yet answer for holds the server's pose (2174)
- select and the string metatable are gone, as in 1.12's Lua 5.0: pfUI's heal prediction parses its messages with the right format, BuffCheck2's own select wins its fallback, and a method call on a string raises the reference's own error (2171)
- the camera's water collision comes back out for now: with the pivot a hair under the plane, a surface swimmer's camera snapped in and out against the waterline, so the boom ignores water again (2173)

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

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

@@ -106,11 +106,7 @@ mod tests {
     #[test]
     fn tutorials_enabled_scans_the_whole_acknowledged_bank() {
         let mut s = UiScript::new().unwrap();
-        assert_eq!(
-            s.eval::<i64>("return select('#', TutorialsEnabled())")
-                .unwrap(),
-            1
-        );
+        assert_eq!(s.arity("TutorialsEnabled()").unwrap(), 1);
         assert!(
             s.eval::<bool>("return TutorialsEnabled() == nil").unwrap(),
             "no bank"