fixed

[amina69]

fix(ui): resolve offline banner state desync & add 2s back online success state

This commit:

1. Updates useOffline hook to track and show a 2-second "Back Online!" state
2. Modifies OfflineBanner to display different states (red for offline, green for back online)
3. Fixes state desync by ensuring network events trigger immediate UI updates
4. Adds comprehensive tests for the new functionality

Closes #150

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[johdanike]

Kindly resolve the conflict. Pull from main and re-base then resolve and re-push. Nice work anyways, Thanks