⚡ Bolt: Batch @Published array updates to prevent UI stuttering

[acebytes]

💡 What: Replaced element-by-element mutations of @Published struct arrays in CacheoutViewModel with single-assignment functional map transformations.

🎯 Why: Mutating elements individually inside loops triggers objectWillChange notifications for every item, causing severe unnecessary recalculations.

📊 Impact: Reduces re-renders significantly for potentially large lists of node_modules during multi-select operations.

🔬 Measurement: Verify responsiveness of select/deselect all operations in the UI and observe reduced CPU utilization during these events.

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PR created automatically by Jules for task 4882131191461719760 started by @acebytes

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