Function nextSession

app/store/chat.ts:330–335

(delta: number)

      },

      nextSession(delta: number) {
        const n = get().sessions.length;
        const limit = (x: number) => (x + n) % n;
        const i = get().currentSessionIndex;
        get().selectSession(limit(i + delta));
      },

      deleteSession(index: number) {
        const deletingLastSession = get().sessions.length === 1;