- EffectiveConfigFieldRef as value type; PendingDnsmasqChange/PendingOptionChange/PendingManagedHostsChange
- Multi-file save plan (DnsmasqSaveWritePlan, DnsmasqManagedBackup) and backup/restore in save flow
- Hosts integrated into effective-config save; Hosts.razor uses shared save modal
- IEffectiveConfigDescriptorProvider + IEffectiveConfigFieldBuilder (DI); descriptors from EffectiveConfigSections
- IEffectiveConfigPageEditor, shared descriptor resolution; addn-hosts/dhcp-host descriptor fix
- DnsmasqConfText, IEffectiveConfigDirectiveSerializer; DnsmasqConfigService uses serializer for writes
- IStructuredOptionValueHandler/Registry, DhcpHostOptionValueHandler; Dhcp.razor index-based DeleteRow fix
- SaveService: roll back partial writes on failure; SaveModal: WriteFailed shows backups and Restore button
- Add shared .ec-effective-switch styles in app.css for consistent switch look
- Wrap flag and do-0x20-encode checkboxes in form-check form-switch
- Add aria-label and title for accessibility
- Matches existing KeyOnlyOrValueDisplay (use-stale-cache, add-mac, etc.)
- Fix do-0x20-encode: clearing pending when toggling back to original (Disabled/Default)
- Do0x20EncodeDisplay: uncheck uses pending.OldValue when present
- EffectiveConfigFieldDisplay: use pending.OldValue as _valueAtActivation when re-entering with pending
- Effective config: validation errors/warnings in toolbar and save modal, revert from modal
- Custom displays: Do0x20EncodeDisplay (tri-state), KeyOnlyOrValueDisplay
- ExplicitToggleState, config/apply support for do-0x20-encode, option help and tests