- 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