channel lines get their warm color, and a /wave gets its sentence

- a channel line renders in the channel family's color, not the grey notice row the client consults and throws away
- a text emote composes its sentence — gender and target picked from the game's own tables — so a /wave is a line in chat, not just an animation
- a FontString's `font=` resolves a font object by name and gates the whole block, `<Gradient>` tints the art it sits on, and buttons' state fonts read `font=` too — Bagnon's white boxes and bare stack counts are fixed
- the money frame sizes its coins from the digits themselves, so Bagnon's gold stops opening cramped

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

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

@@ -24,6 +24,10 @@ pub(crate) struct Model {
     pub(crate) addons: Vec<super::addon::AddOnInfo>,
     /// The AddOns folder, so `LoadAddOn` can read an addon's files from inside a Lua binding.
     pub(crate) addons_root: Option<std::path::PathBuf>,
+    /// NumberFontNormal's per-digit advances, `'0'..='9'` ([`super::UiScript::set_digit_advances`])
+    /// — the synchronous stand-in for a text measure, read by the `BenillaNumberWidth` binding.
+    /// `None` until the host feeds them, which is every VM without a font atlas (every engine test).
+    pub(crate) digit_advances: Option<[f32; 10]>,
     /// Where per-addon saved variables live: the account-scoped folder, then this character's.
     /// Both are directories holding one `<Addon>.lua` per declaring addon.
     pub(crate) addons_saved_account: Option<std::path::PathBuf>,
@@ -1010,6 +1014,7 @@ impl Model {
         Model {
             addons: Vec::new(),
             addons_root: None,
+            digit_advances: None,
             addons_saved_account: None,
             addons_saved_character: None,
             framexml_templates: Default::default(),