Font menu: the wasm build has no unread wheel-field warnings

The queued and replayed wheel events of the font menu are read only by
native-only code (the viewport-layer plugin and the replay loop). Their
fields that only that code reads (frame, menu, position, event and
amount of QueuedWheel, and target of ReplayWheel) and the push that
fills the queue now carry the same cfg(not(target_arch = "wasm32")) as
their readers, so
`cargo check --target wasm32-unknown-unknown -p vectorcraft-ui-egui`
no longer warns that they are never read. Native builds do not change.

crates/ui-egui/src/font_menu.rs

@@ -443,12 +443,17 @@ struct WheelField {
 
 #[derive(Clone)]
 struct QueuedWheel {
+    #[cfg(not(target_arch = "wasm32"))]
     frame: u64,
     field: egui::Id,
+    #[cfg(not(target_arch = "wasm32"))]
     menu: egui::Id,
+    #[cfg(not(target_arch = "wasm32"))]
     position: egui::Pos2,
     rect: egui::Rect,
+    #[cfg(not(target_arch = "wasm32"))]
     event: egui::Event,
+    #[cfg(not(target_arch = "wasm32"))]
     amount: f32,
     reset_after: bool,
     positions_after: Vec<egui::Pos2>,
@@ -456,6 +461,7 @@ struct QueuedWheel {
 
 #[derive(Clone)]
 struct ReplayWheel {
+    #[cfg(not(target_arch = "wasm32"))]
     target: egui::LayerId,
     position: egui::Pos2,
     event: egui::Event,
@@ -791,6 +797,7 @@ pub(crate) fn take_raw_wheel(ctx: &egui::Context, raw: &mut egui::RawInput) {
                         egui::MouseWheelUnit::Line | egui::MouseWheelUnit::Page => delta.y,
                     };
                     if cfg!(not(target_arch = "wasm32")) && ctx.viewport_id() != raw.viewport_id {
+                        #[cfg(not(target_arch = "wasm32"))]
                         if let Some(position) = pointer {
                             fields.queued.push(QueuedWheel {
                                 frame,