Texture and FontString stop answering each other's methods

- the one shared region table splits into the client's own maps: a Texture no longer answers SetText, a FontString no longer answers SetTexture, and feature-detecting addons see the true surface
- CreateTitleRegion lands whole — object and drag — so an options window that is its own drag handle actually moves
- font-object names resolve whatever their case, and the CursorUpdate/CursorOnUpdate pair arrives for the container-item templates
- GetStringHeight is pruned (1.12 has no such method) and SetPortraitToTexture moves to the global it really is

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -28,7 +28,7 @@ use crate::widget::{FrameHandle, FrameKind};
 mod events_regions;
 mod frame_state;
 mod layout_methods;
-mod movable;
+pub(crate) mod movable;
 pub(crate) mod toplevel;
 pub(crate) use layout_methods::anchor_bits_eq;
 pub(crate) use movable::{advance_move, advance_size, FrameMove, FrameSizing};