⚡ Bolt: [performance improvement] Optimize collection operations in view models

[acebytes]

💡 What: Replaced eager .filter operations with .lazy.filter before .count and .reduce, and used .contains(where:) instead of .isEmpty on filtered arrays.
🎯 Why: To prevent intermediate array allocations and O(N) operations in SwiftUI computed properties, avoiding memory churn during render cycles.
📊 Impact: Eliminates unnecessary memory allocations during view updates.
🔬 Measurement: Profile with Instruments (Allocations) to verify reduced array initializations during UI interactions.

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PR created automatically by Jules for task 13073970592502131949 started by @acebytes

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