chore(core/rust): Add int variant to tracing

core/embed/rust/src/trace.rs

@@ -1,5 +1,6 @@
 /// Visitor passed into `Trace` types.
 pub trait Tracer {
+    fn int(&mut self, i: i64);
     fn bytes(&mut self, b: &[u8]);
     fn string(&mut self, s: &str);
     fn symbol(&mut self, name: &str);
@@ -25,6 +26,12 @@ impl Trace for &str {
     }
 }
 
+impl Trace for usize {
+    fn trace(&self, t: &mut dyn Tracer) {
+        t.int(*self as i64);
+    }
+}
+
 impl<T> Trace for Option<T>
 where
     T: Trace,

core/embed/rust/src/ui/layout/obj.rs

@@ -169,6 +169,10 @@ impl LayoutObj {
         struct CallbackTracer(Obj);
 
         impl Tracer for CallbackTracer {
+            fn int(&mut self, i: i64) {
+                self.0.call_with_n_args(&[i.try_into().unwrap()]).unwrap();
+            }
+
             fn bytes(&mut self, b: &[u8]) {
                 self.0.call_with_n_args(&[b.try_into().unwrap()]).unwrap();
             }

core/embed/rust/src/ui/model_t1/layout.rs

@@ -84,6 +84,10 @@ mod tests {
     use super::*;
 
     impl Tracer for Vec<u8> {
+        fn int(&mut self, i: i64) {
+            self.string(&i.to_string());
+        }
+
         fn bytes(&mut self, b: &[u8]) {
             self.extend(b)
         }

core/embed/rust/src/ui/model_tt/layout.rs

@@ -59,6 +59,10 @@ mod tests {
     use super::*;
 
     impl Tracer for Vec<u8> {
+        fn int(&mut self, i: i64) {
+            self.string(&i.to_string());
+        }
+
         fn bytes(&mut self, b: &[u8]) {
             self.extend(b)
         }