feat(core/ui): introduce FlowMsg::Text option

This commit allows flows to work with ShortString which can be converted
to micropython as str.

[no changelog]

core/embed/rust/src/ui/flow/base.rs

@@ -1,4 +1,7 @@
-use crate::ui::component::{base::AttachType, swipe_detect::SwipeConfig, SwipeDirection};
+use crate::{
+    strutil::ShortString,
+    ui::component::{base::AttachType, swipe_detect::SwipeConfig, SwipeDirection},
+};
 
 pub trait Swipable {
     fn get_swipe_config(&self) -> SwipeConfig;
@@ -11,16 +14,17 @@ pub trait Swipable {
 ///
 /// Also currently the type for message emitted by Flow::event to
 /// micropython. They don't need to be the same.
-#[derive(Copy, Clone)]
+#[derive(Clone)]
 pub enum FlowMsg {
     Confirmed,
     Cancelled,
     Info,
     Choice(usize),
+    Text(ShortString),
 }
 
 /// Composable event handler result.
-#[derive(Copy, Clone)]
+#[derive(Clone)]
 pub enum Decision {
     /// Do nothing, continue with processing next handler.
     Nothing,

core/embed/rust/src/ui/flow/swipe.rs

@@ -363,6 +363,11 @@ impl ObjComponent for SwipeFlow {
             Some(FlowMsg::Choice(i)) => {
                 Ok((crate::ui::layout::result::CONFIRMED.as_obj(), i.try_into()?).try_into()?)
             }
+            Some(FlowMsg::Text(s)) => Ok((
+                crate::ui::layout::result::CONFIRMED.as_obj(),
+                s.as_str().try_into()?,
+            )
+                .try_into()?),
         }
     }
     fn obj_paint(&mut self) {