Fix panic on fast reconnection of node

[qoke]

Multiple goroutines calling AddNode and RemoveNode cause panics when trying to close a channel that was already closed, which can happen when a node changes network transport quickly (eg mobile->wifi) and reconnects whilst also disconnecting.

Added test and fix

[ghost]

Pull Request Revisions

Revision	Description
r2	Simplified goroutine closure parameter Modified anonymous goroutine in AddNode to remove redundant nodeID parameter, improving function signature simplicity
r1	Added safe channel closing mechanism Introduced safeCloseChannel method to handle channel closing with panic recovery and added race condition test for node management

✅ AI review completed for r2

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[kradalby]

Im on holiday, will take a look when I get back.

[kradalby]

Good catch!