fix: 3 bug standalone — soundfont preview/play, Carla bridge play item, realtime sync LAN/Tauri
Bug1: dispatcher CREATE_MIDI_ITEM track_id number vs state string -> String(); play+preview native soundfont verified.
Bug2: Carla play item — chờ OSC ready (poll carla-status, queue nốt khi cold start), chống spawn trùng (carla-status dò port bind, open-in-carla skip khi đã chạy).
Bug3: realtime sync — GET /temp/revision (updated_at+client_id), poll 3s, apply qua deserializeProjectFromSchema; hash-skip autosave + client_id chống ping-pong.
3dtours
aa1cd8d5de