chat window now displays session name instead of UUID, and added delete confirmation for session

packages/chat-client/src/App.jsx

@@ -35,6 +35,13 @@ export default function App() {
     sendMessage(text, selectedModel);
   }
 
+  function handleSessionsChange(deletedSession){
+    if(deletedSession?.external_id === activeSession?.external_id){
+      selectSession(null);
+    }
+    refreshSessions();
+  }
+
   return (
     <div style={{
       display: 'flex',
@@ -48,7 +55,7 @@ export default function App() {
         onNewChat={createSession}
         isOpen={leftOpen}
         onToggle={() => setLeftOpen(o => !o)}
-        onSessionsChange={refreshSessions}
+        onSessionsChange={handleSessionsChange}
       />
 
       <ChatWindow