⚡ Bolt: optimize TimelineView scope in RunningView

[google-labs-jules]

💡 What: Scoped TimelineView tightly around CountdownRing.
🎯 Why: Wrapping static views in a TimelineView forces unnecessary re-evaluation on every tick.
📊 Impact: Reduces CPU and memory overhead during the active session.
🔬 Measurement: Profile SwiftUI view updates in Instruments to see fewer re-renders.

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PR created automatically by Jules for task 8113263039104295865 started by @TytaniumDev

[google-labs-jules]

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