ChatViewModel Extensions

This directory contains extensions to ChatViewModel to modularize its functionality.

ChatViewModel+Tor.swift: Handles Tor lifecycle events and notifications.
ChatViewModel+PrivateChat.swift: Manages private chat logic, media transfers (images, voice notes), and file handling.
ChatViewModel+Nostr.swift: Contains all logic related to Nostr integration, Geohash channels, and Nostr identity management.

The main ChatViewModel.swift retains core state, initialization, and coordination logic.