refactor: add message for next receive address

The Next message will be used for getting the next page
of unused addresses.

liana-gui/src/app/state/receive.rs

@@ -156,7 +156,7 @@ impl State for ReceivePanel {
                 ));
                 Task::none()
             }
-            Message::View(view::Message::Next) => {
+            Message::View(view::Message::NextReceiveAddress) => {
                 let daemon = daemon.clone();
                 Task::perform(
                     async move {
@@ -364,7 +364,11 @@ mod tests {
         let cache = Cache::default();
         let sandbox = sandbox.load(client.clone(), &cache, wallet).await;
         let sandbox = sandbox
-            .update(client, &cache, Message::View(viewMessage::Next))
+            .update(
+                client,
+                &cache,
+                Message::View(viewMessage::NextReceiveAddress),
+            )
             .await;
 
         let panel = sandbox.state();

liana-gui/src/app/view/message.rs

@@ -14,6 +14,7 @@ pub enum Message {
     Select(usize),
     SelectPayment(OutPoint),
     Label(Vec<String>, LabelMessage),
+    NextReceiveAddress,
     Settings(SettingsMessage),
     CreateSpend(CreateSpendMessage),
     ImportSpend(ImportSpendMessage),

liana-gui/src/app/view/receive.rs

@@ -45,7 +45,7 @@ pub fn receive<'a>(
                 .push(Container::new(h3("Receive")).width(Length::Fill))
                 .push(
                     button::primary(Some(icon::plus_icon()), "Generate address")
-                        .on_press(Message::Next),
+                        .on_press(Message::NextReceiveAddress),
                 ),
         )
         .push(p1_bold("New and never used reception addresses"))