fix(desktop): identify stale hosted catalog results

crates/oa-desktop/src/hosted/mod.rs

@@ -76,6 +76,7 @@ pub struct State {
     pub token: Secret,
     pub query: String,
     pub catalog: Vec<Summary>,
+    pub catalog_stale: bool,
     pub next: Option<Id>,
     pub selected: Option<Id>,
     pub connection: Option<Connection>,
@@ -97,6 +98,7 @@ impl Default for State {
             token: Secret::default(),
             query: String::new(),
             catalog: vec![],
+            catalog_stale: true,
             next: None,
             selected: None,
             connection: None,
@@ -113,6 +115,23 @@ impl Default for State {
 }
 
 impl State {
+    pub fn invalidate_catalog(&mut self) {
+        self.catalog_stale = true;
+        self.next = None;
+    }
+
+    pub fn catalog_message(&self) -> Option<&'static str> {
+        if self.connection.is_none() {
+            Some("Connect / refresh to load models for this service.")
+        } else if self.catalog_stale {
+            Some("Catalog may be out of date. Connect / refresh to update these results.")
+        } else if self.catalog.is_empty() {
+            Some("No models found. Publish the current model or change the search.")
+        } else {
+            None
+        }
+    }
+
     /// Keep explicit connection settings in memory, but never carry a resource
     /// binding or in-flight result into another local document.
     pub fn leave_document(&mut self) {

crates/oa-desktop/src/hosted/view.rs

@@ -180,10 +180,8 @@ fn dialog(app: &App) -> Element<'_, Message> {
         ]
         .spacing(8),
     );
-    if state.connection.is_some() && state.catalog.is_empty() {
-        content = content.push(label(
-            "No models found. Publish the current model or change the search.",
-        ));
+    if let Some(message) = state.catalog_message() {
+        content = content.push(label(message));
     }
     for item in &state.catalog {
         let selected = state.selected == Some(item.resource_id);
@@ -208,7 +206,7 @@ fn dialog(app: &App) -> Element<'_, Message> {
             .on_press_maybe(enabled.then_some(Message::Hosted(Event::Select(item.resource_id)))),
         );
     }
-    if state.next.is_some() {
+    if !state.catalog_stale && state.next.is_some() {
         content = content.push(control("More models", Event::More, enabled));
     }
     let publish_label = if state