Got hacked

After logging into my official Monero GUI wallet, I discovered my balance was completely emptied (0.000000 XMR) by an unknown transaction showing no recipient or transaction key, despite using a local node, never sharing my seed or password, storing the wallet on an old Mac running macOS Sonoma, always using a VPN and Tor, and I’m now trying to understand how this happened and whether there’s any way to trace where the funds went.