Refactor: migrate pageVisibility from Vuex to browserInfo composable

[prakhar0608shrma]

Summary

This PR refactors Kolibri's page visibility tracking by removing the Vuex-based pageVisibility state and replacing it with a reactive composable in browserInfo.js. This simplifies state management and allows components to directly respond to visibility changes without relying on Vuex actions.

Changes

• Added pageVisibilityRef and usePageVisibility() composable in packages/kolibri/utils/browserInfo.js
• Removed setPageVisibility action and debounce logic from core/frontend/state/actions.js
• Removed store.dispatch('setPageVisibility') from core/frontend/index.js
• Verified that no components rely on Vuex pageVisibility anymore

Testing

• Ran yarn run devserver and confirmed visibility changes are correctly tracked when switching tabs or minimizing the window
• Verified visibility state updates via usePageVisibility()
• All unit and integration tests pass (yarn test, pytest)

Screenshots

N/A

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[nucleogenesis]

Thank you for your interest in contributing to our project @prakhar0608shrma

In the future, please review our Contributor's Guidelines before submitting a pull request.

I believe that this PR is intended to fix #13143 but your changes appear to be automatically generated given the arbitrary decision to remove all comments throughout the files that are changed.

I'll close this and hope to see you reaching out in our Help Wanted issues!