ui: fix thread-safety issue by passing a copy of the network list to callbacks

[deanlee]

Previously, the original mutable network list (self._networks) was passed directly to callbacks. This could cause race conditions.

Example from logging:

Enqueuing callback: <bound method NetworkLayoutMici._on_network_updated of <...NetworkLayoutMici object at 0x7f638b3e3390>> with args: id: 140065515005056
Processing network update in UI with arg id: 140065515005056

The same object ID appears in both threads, confirming that the mutable object was shared.

Change: Pass a copy of the network list to callbacks to ensure each thread works with an independent, thread-safe snapshot.

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mici raylib UI Preview

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[sshane]

Why close?