⚡ Bolt: Tighten TimelineView scope in RunningView

[google-labs-jules]

💡 What: Scoped TimelineView tightly around only the dynamic CountdownRing instead of the entire VStack.
🎯 Why: Wrapping static views in TimelineView forces unnecessary re-evaluation on every 1-second tick.
📊 Impact: Reduces SwiftUI re-renders significantly.
🔬 Measurement: Profile the view hierarchy rendering in Instruments - time spent in RunningView body evaluation should decrease.

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PR created automatically by Jules for task 14950563954128512135 started by @TytaniumDev

[google-labs-jules]

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