⚡ Bolt: Batch UI updates for list selections

[acebytes]

💡 What: Replaced element-by-element mutation loops with .map reassignments for @Published arrays in CacheoutViewModel.

🎯 Why: Mutating individual elements of a @Published array inside a loop triggers a UI update notification for every change. For collections of value types, functional methods like map batch updates into a single property assignment, significantly reducing unnecessary UI recalculations.

📊 Impact: O(1) view updates instead of O(N) when selecting or deselecting large numbers of items, improving perceived application responsiveness.

🔬 Measurement: Observe UI stuttering elimination when using "Select All" actions on a large populated list of cache items or node_modules directories.

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PR created automatically by Jules for task 1936215077749242678 started by @acebytes

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