⚡ Bolt: Batch UI updates for @Published arrays

[acebytes]

💡 What: Refactored array updates in CacheoutViewModel to use .map functional assignment.

🎯 Why: Mutating @published array elements in a loop triggers a UI update per iteration.

📊 Impact: Batches updates into a single property assignment, significantly reducing unnecessary UI recalculations.

🔬 Measurement: Review test run and UI performance on selection toggles.

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PR created automatically by Jules for task 5305827594153494830 started by @acebytes

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