fix offset reference

[shounbi]

Update zoneOffset reference

[gemini-code-assist]

Code Review

This pull request updates writeSleepSessionWithStage and writeSleepSessionWithoutStage in HealthConnectManager.kt to dynamically calculate and use the system's local zone offset instead of hardcoding UTC. However, the reviewer pointed out that in both functions, the constructed SleepSessionRecord is never actually written to the healthConnectClient or returned, making the operations ineffective. To resolve this, the functions should be marked as suspend and the records should be saved using healthConnectClient.insertRecords().

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