⚡ Bolt: Optimize O(N^2) timeline.NodeStates lookup inside ApplySimulationOutcomes

[google-labs-jules]

💡 What: Pre-computed a nodeStatesByNodeId dictionary outside the foreach (var node in Scene.Nodes) loop inside the ApplySimulationOutcomes method.

🎯 Why: Previously, the logic was executing .Where over the entire timeline.NodeStates collection twice for every single node in the network to resolve state and backlogByTraffic. This essentially behaved as an $O(N \times S)$ operation, causing significant UI rendering overhead when playing back timeline steps on large graphs.

📊 Impact: Reduces the time complexity from $O(N \times S)$ to $O(N + S)$, dramatically reducing allocations and improving playback framerate for large simulations.

🔬 Measurement: Validated via MedWNetworkSim.Avalonia.Verification and core tests.

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PR created automatically by Jules for task 7923459356031527006 started by @wnj00524

[google-labs-jules]

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