feat: Enhance session loading with cancellation and interval refresh

src/App.tsx

@@ -12,6 +12,8 @@ const App: React.FC = () => {
   const [errorMessage, setErrorMessage] = useState<string | null>(null);
 
   useEffect(() => {
+    let isCancelled = false;
+
     const load = async () => {
       setLoadState("loading");
       setErrorMessage(null);
@@ -22,16 +24,28 @@ const App: React.FC = () => {
           (a, b) =>
             new Date(b.endedAt).getTime() - new Date(a.endedAt).getTime()
         );
-        setSessions(sorted);
+
-        setLoadState("success");
+        if (!isCancelled) {
+          setSessions(sorted);
+          setLoadState("success");
+        }
       } catch (err) {
         console.error(err);
-        setErrorMessage("Could not load charging data.");
+        if (!isCancelled) {
-        setLoadState("error");
+          setErrorMessage("Could not load charging data.");
+          setLoadState("error");
+        }
       }
     };
 
     load();
+
+    const id = setInterval(load, 5000);
+
+    return () => {
+      isCancelled = true;
+      clearInterval(id);
+    };
   }, []);
 
   const latestSession = sessions[0] ?? null;