⚡ Bolt: remember item lambdas to prevent LazyColumn recompositions

[felixbrucker]

💡 What: Remember lambda callbacks for items and cards in SleepTrackerScreen (SleepSessionItem, BedtimeReminderCard, HealthConnectSyncCard).
🎯 Why: When active sleep tracking is running, currentDurationMillis updates every second, causing SleepTrackerScreen to recompose. Unremembered lambdas created inside LazyColumn item scopes created new instances on every tick, causing every SleepSessionItem in the list to fail Compose skipping checks and recompose unnecessarily.
📊 Impact: Eliminates N unnecessary recompositions per second (where N is the number of recorded sleep sessions), saving CPU cycles and battery during active tracking.
🔬 Measurement: Verified with ./gradlew test and ./gradlew lint.

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PR created automatically by Jules for task 1542351725572696274 started by @felixbrucker

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