⚡ Bolt: Optimize voter diffing with O(1) Set lookups

[yeboster]

💡 What: Replaced Array.prototype.includes() inside an Array.prototype.filter() loop with an $O(1)$ Set.prototype.has() lookup in both /api/proposals/voters/add and /api/proposals/voters/remove.
🎯 Why: Iterating over a potentially large list of owners and performing an $O(N)$ lookup on voters (and vice-versa) leads to an $O(N \times M)$ performance bottleneck that synchronously blocks the main thread.
📊 Impact: Reduces array intersection complexity from $O(N \times M)$ to $O(N + M)$, ensuring endpoints remain fast and responsive regardless of how large the voter and owner arrays grow.
🔬 Measurement: Verified logic via unit tests. Run a local profiling session before and after the change with arrays of 5000 elements to observe the immediate reduction in main-thread blocking time.

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PR created automatically by Jules for task 9028590220454430785 started by @yeboster

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Project	Deployment	Actions	Updated (UTC)
app	Error		Jun 25, 2026 7:56pm