a slider snaps to its step, a pushed button releases, and warnings show

- a slider with a value step snaps to it: a stepped drag fires once per row instead of once per pixel, a scrollbar cannot rest between two rows, and one wheel notch on the trainer list reaches the bottom (2133)
- setting a step on a live slider moves its value onto the new lattice and runs its handler, which an addon on the real client can count on (2143)
- a button pushed from script releases on the next mouse-up, so Tablet-2.0's rows stop staying pressed forever; a release off the button's rect un-presses it, and a locked state holds (2134)
- the mail body and the GM ticket box scroll as you type past their bottom, and the Use UI Scale checkbox reads a registered setting (2141)
- an engine warning, a call that was accepted and did nothing, reaches the /errors window in grey instead of one terminal line; a text row trimmed mid-character no longer kills the window's repaint (2135, 2138)

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

crates/benilla-ui/src/script/simplehtml/mod.rs

@@ -244,7 +244,9 @@ pub(crate) fn set_text(model: &mut Model, fh: FrameHandle, raw: &str) -> bool {
     let parsed = parse::parse_markup(raw, &frame_name, &hyperlink_format);
     // The reference pushes these through the frame's error sink to the console. Ours are host
     // warnings: a malformed page is the player's content being wrong, not a script raising.
-    model.warnings.extend(parsed.errors.iter().cloned());
+    for e in &parsed.errors {
+        model.record_warning(e.clone());
+    }
 
     build(model, fh, &parsed.blocks);
     parsed.used_markup
@@ -836,7 +838,8 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
         "SetText",
         lua.create_function(|lua, (this, text): (Table, Value)| {
             let raw = match &text {
-                Value::String(s) => s.to_str()?.to_string(),
+                // Bytes, lossily — never a raise (2138).
+                Value::String(s) => s.to_string_lossy(),
                 Value::Number(_) | Value::Integer(_) => super::object::as_f32(&text).to_string(),
                 _ => String::new(),
             };