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Resource-backed snackbars (showKvittSnackbar) in account, onboarding and settings; SettingsScaffold replaced by KvittScaffold + SettingsMessageEffect. KvittButton(loading) for S-6 saving and S-16 Synka nu. S-10 missing state disables Synka nu offline (connectivity in the ViewModel, new detail_missing_offline goldens). S-6 system back asks to discard unsaved changes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B