Restructure BatteryOptimizationEnabledContent to use proper scrolling behavior and fixed button placement at the bottom. The changes ensure better usability by preventing content from being hidden behind buttons and allowing full content visibility through scrolling.
This commit refactors the `MainViewModel` to use `StateFlow` instead of `mutableStateOf` for managing its observable properties. This change improves the way UI state is handled and observed, aligning with modern Android development best practices.
Additionally, `OnboardingState.kt` has been moved to the `onboarding` package for better organization.