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Fixed "Object has been destroyed" crash: All IPC calls from WebSocket handlers now use a safe _send() helper that checks if the window and its webContents are still alive before sending. This eliminates the TypeError: Object has been destroyed crash that occurred when closing the app while WebSocket connections were still active.
New — Duplicate Instance Detection
Single instance lock: ReactoRadar now prevents multiple instances from running simultaneously. If you try to open a second copy, you'll see a clear error dialog explaining the conflict, and the existing window will be focused instead.
Port conflict dialog: If bridge ports (9090, 9091, 9092) are occupied by an old/stuck process, a dialog now shows the exact terminal command to kill it: kill $(lsof -ti :9092)