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Official builds authenticate against the hosted Overlay Server at https://getoverlay.io. Flow:
  1. Desktop opens the system browser to the server sign-in page.
  2. After success, the browser returns via an overlay:// callback.
  3. Main process validates the handoff and stores session material using OS secure storage / Keychain-backed APIs.
Hosted mode still requires Overlay Server for account features, hosted models, entitlements, and billing. Local notes and some tools can work on-device after sign-in depending on configuration.