Extract ScannerStatusCard<T> and PaginationBar so the ARP/mDNS cards and
the two paginated lists share one implementation each. Also fold the
four UISnackbars methods over a severity enum and fix Notification.toJson
serializing a method tear-off instead of the enum name.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Centralises all SnackBar calls behind UISnackbars.showError/showSuccess/
showWarning/showInfo, each themed via AppColorExtension. New warning and
info colour tokens added to both themes. Calling any method clears any
visible snackbar before showing the new one.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds a dropdown in the settings page to switch between available themes
(Catppuccin Mocha, Gruvbox Dark). The selected theme is applied immediately
on save and persisted across restarts via SharedPreferences.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
