47e7762437addc42e58b0b1c05a12820bf0e2805
Add a 'Presence' section to Settings with three radio options wired to the persisted PresenceMode (W7): Normal (friends only, no beacon; default), Invisible (appear offline to everyone), Discoverable (also publish so friends can find you after a network change). Each has a hover tooltip explainer, mirroring the recording-mode radios. Selecting one saves config.presence_mode. The live friends listener (P4, not yet wired) will read this posture when it lands; no core command until then. 256 lib tests green, clippy clean, release builds. Solo screenshot-verifiable (the live effect needs P4 + 2 machines). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>