refactor(settings): reorganize settings dialog with new form components

Use NcFormBox, NcFormBoxSwitch, and related components to modernize
the settings dialog layout following the new design patterns.

- Replace CheckboxRadioSwitch with NcFormBoxSwitch for social sync
- Wrap sort select in NcFormBox for consistent styling
- Convert new address book to button with expandable form
- Update address book list styling with borders and proper spacing
- Add success/error toast notifications for setting changes
- Bump @nextcloud/vue to ^9.2.0 for NcFormBox components

Signed-off-by: nfebe <fenn25.fn@gmail.com>

Author: nfebe