- Word: use AddChild for TitlePage in sectPr to respect schema order
- Word: use AppendToParent in CopyFrom to insert before SectionProperties
- Word: use AddChild for UpdateFieldsOnOpen/DisplayBackgroundShape in Settings
- Word: fix EnsurePageMargin to insert after PageSize instead of AppendChild
- Excel: only report true bool props in Format (false is OOXML default)
- Excel: clear bool attributes and cleanup empty elements when setting to false
PopulateWorkbookSettings used == true filter which dropped explicit false
values. Changed 8 conditions to != null so false is distinguishable from
unset, consistent with the PPT show.narration fix.
