[Feature Request] Add Kotlin 2.0+ support for Store v4

No files or tests are named. Start by locating Store v4 usages of Duration.hours(...) and similar kotlin.time APIs, then identify the existing Kotlin compatibility checks; done means Store v4 builds and its relevant tests pass with Kotlin 2.0+ without requiring a Store v5 migration.

Is your feature request related to a problem? Please describe.
Many projects (like ours) are still using Store v4 due to stability and API familiarity. However, Store v4 breaks with Kotlin 2.0+ due to usage of older kotlin.time APIs like Duration.hours(...), which are now removed in Kotlin 2.x.

Describe the solution you'd like
Backport Kotlin 2.0+ compatibility changes into Store v4 — specifically, replace usages of Duration.hours(...) and similar deprecated APIs to ensure compatibility with Kotlin 2.x, without requiring a full upgrade to Store v5.

Describe alternatives you've considered

• Migrating to Store v5, but it contains significant API changes and would require a lot of code rewrite in large codebases.
• Forking Store v4 and maintaining it internally, which works but is not ideal for long-term maintainability.

Additional context
Store v4 is still widely used in many production apps. Providing Kotlin 2.x support will help teams adopt latest Kotlin versions without breaking existing architecture. We'd really appreciate official support to avoid maintaining internal forks.