⚡ Bolt: [performance improvement] Short-circuit evaluation and prevent intermediate array allocations

[acebytes]

💡 What: Replaced eager .isEmpty checks on filtered collections with early-exiting .contains(where:) in hasSelection, and chained .lazy.filter before .reduce in selectedSize.

🎯 Why: SwiftUI computed properties are evaluated very frequently during render cycles. Unnecessary intermediate array allocations (from eager filters) and full traversals (from reducing over size > 0) create avoidable memory and CPU overhead.

📊 Impact: Eliminates O(N) array memory allocations for selectedSize and hasSelection, and turns hasSelection from a full O(N) collection iteration into an O(1) best-case / early-exit operation.

🔬 Measurement: Run Time Profiler/Allocations instruments during UI updates (checking and unchecking checkboxes); view fewer [ScanResult] heap allocations and faster hasSelection getter resolution.

---

PR created automatically by Jules for task 6607650057219304508 started by @acebytes

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.