Migrate from multiplatform-settings to datastore

Description

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[x] I have tested the changes on both Android, iOS and Desktop platforms.
[ ] I have written unit tests for the new code (if applicable).
[ ] I have updated the project's documentation (if necessary).
[x] I have checked for any potential code duplications and removed them.
[x] I have run the Kotlin/Compose Multiplatform Gradle tasks and verified that they were completed successfully.
[x] I have considered the impact of these changes on the existing codebase.

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