Fix signout and redesign auth step

src/lib/google.ts

@@ -81,13 +81,33 @@ export function handleSignIn() {
 }
 
 export function handleSignOut() {
-  const token = gapi.client.getToken();
-  if (token !== null) {
-    google.accounts.oauth2.revoke(token.access_token, () => {
-      gapi.client.setToken(null);
-      isSignedIn.set(false);
-    });
-  }
+	const savedToken = localStorage.getItem(TOKEN_KEY);
+	if (savedToken) {
+		try {
+			const tokenData = JSON.parse(savedToken);
+			if (tokenData.access_token) {
+				google.accounts.oauth2.revoke(tokenData.access_token, () => {
+					console.log('User token revoked.');
+				});
+			}
+		} catch (e) {
+			console.error('Error parsing token from localStorage', e);
+		}
+	}
+
+	// Disables automatic sign-in on the next page load.
+	google.accounts.id.disableAutoSelect();
+
+	// Clear gapi client token
+	gapi.client.setToken(null);
+
+	// Clear token from localStorage
+	localStorage.removeItem(TOKEN_KEY);
+
+	// Update signed in state
+	isSignedIn.set(false);
+
+	console.log('User signed out.');
 }
 
 export async function searchSheets(query: string) {