agent2: Show Zed AI onboarding (#36406)

Release Notes:

- N/A

crates/agent_ui/src/acp/thread_view.rs

@@ -2444,12 +2444,15 @@ impl AcpThreadView {
             .into_any()
     }
 
-    fn as_native_connection(&self, cx: &App) -> Option<Rc<agent2::NativeAgentConnection>> {
+    pub(crate) fn as_native_connection(
+        &self,
+        cx: &App,
+    ) -> Option<Rc<agent2::NativeAgentConnection>> {
         let acp_thread = self.thread()?.read(cx);
         acp_thread.connection().clone().downcast()
     }
 
-    fn as_native_thread(&self, cx: &App) -> Option<Entity<agent2::Thread>> {
+    pub(crate) fn as_native_thread(&self, cx: &App) -> Option<Entity<agent2::Thread>> {
         let acp_thread = self.thread()?.read(cx);
         self.as_native_connection(cx)?
             .thread(acp_thread.session_id(), cx)

crates/agent_ui/src/agent_panel.rs

@@ -2619,7 +2619,13 @@ impl AgentPanel {
         }
 
         match &self.active_view {
-            ActiveView::Thread { .. } | ActiveView::TextThread { .. } => {
+            ActiveView::History | ActiveView::Configuration => false,
+            ActiveView::ExternalAgentThread { thread_view, .. }
+                if thread_view.read(cx).as_native_thread(cx).is_none() =>
+            {
+                false
+            }
+            _ => {
                 let history_is_empty = self
                     .history_store
                     .update(cx, |store, cx| store.recent_entries(1, cx).is_empty());
@@ -2634,9 +2640,6 @@ impl AgentPanel {
 
                 history_is_empty || !has_configured_non_zed_providers
             }
-            ActiveView::ExternalAgentThread { .. }
-            | ActiveView::History
-            | ActiveView::Configuration => false,
         }
     }