Fix clear sessione

frontend/src/App.jsx

@@ -4,7 +4,7 @@ import "./App.css";
 import { themes } from "./themes";
 import ChatLayout from "./ChatLayout";
 import { useChatStream } from "./useChatStream";
-import { getSessionId, getUserId, resetSessionId, setSessionId } from "./useSessionId";
+import { getSessionId, getUserId, clearSessionId, setSessionId } from "./useSessionId";
 
 export default function App() {
   const { messages, loading, sendMessage, stopGenerating, setMessages } = useChatStream();
@@ -54,8 +54,8 @@ export default function App() {
   const freshStart = async () => {
     await fetch(`/v1/history?user_id=${userId}&session_id=${sessionId}`, { method: "DELETE" });
     setMessages([]);
-    const newId = resetSessionId();
-    setSessionId(newId);
+    clearSessionId(); // <-- ora rimuove del tutto la sessione
+    setSessionName("");
   };
 
   const createSession = async () => {

frontend/src/useSessionId.js

@@ -13,24 +13,12 @@ export function getSessionId() {
   return localStorage.getItem("sessionId") || null;
 }
 
-export function getSessionIdForced() {
-  // Always re‑read localStorage so latest value is returned
-  let id = localStorage.getItem("sessionId");
-  if (!id) {
-    id = crypto.randomUUID();
-    localStorage.setItem("sessionId", id);
-  }
-  return id;
-}
-
 export function setSessionId(id) {
   localStorage.setItem("sessionId", id);
 }
 
-export function resetSessionId() {
-  const newId = crypto.randomUUID();
-  localStorage.setItem("sessionId", newId);
-  return newId;
+export function clearSessionId() {
+  localStorage.removeItem("sessionId");
 }