⚡ Bolt: Optimize @Published array mutations to reduce UI recalculations

[acebytes]

💡 What:
Refactored multiple methods in CacheoutViewModel (selectAllSafe, deselectAll, selectStaleNodeModules, selectAllNodeModules, deselectAllNodeModules) to use .map for updating the @Published arrays scanResults and nodeModulesItems, replacing the previous for loop index-based mutation.

🎯 Why:
In SwiftUI, when a @Published property is an array of value types (like ScanResult or NodeModulesItem), mutating individual elements inside a loop (e.g., scanResults[i].isSelected = true) triggers the objectWillChange publisher for every single iteration. For lists with many items, this results in significant unnecessary work on the main thread as SwiftUI attempts to recalculate the view hierarchy repeatedly.

📊 Impact:
By mapping over the array and assigning the modified array back to the property in a single operation, the publisher emits exactly once per function call. This drastically reduces CPU overhead and main thread blocking during bulk selection/deselection operations.

🔬 Measurement:
To verify, run the application, populate the lists with numerous items (e.g., node_modules folders), and observe the CPU usage or UI responsiveness when clicking "Select All" or "Deselect All". The UI update should be near-instantaneous with minimal main thread spikes compared to the previous implementation.

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PR created automatically by Jules for task 7747625739575382867 started by @acebytes

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