feat(auth): include existing device ID in SSO and password login flows

src/app/pages/auth/login/TokenLogin.tsx

@@ -54,9 +54,11 @@ export function TokenLogin({ token }: TokenLoginProps) {
   >(useCallback(login, []));
 
   useEffect(() => {
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
     startLogin(baseUrl, {
       type: 'm.login.token',
       token,
+      device_id: existingDeviceId,
       initial_device_display_name: 'Paarrot',
     });
   }, [baseUrl, token, startLogin]);