ODT import: section page properties are lost — landscape section, columns and numbering restart #1379

Written by an AI assistant (Claude) at the request of @mmazzieri.

Version: wordcraft-cli 0.6.1 (Windows x64); checked again on main 159b84f.

Steps: wordcraft-cli convert S11-sezioni.odt out.docx (or out.pdf). Synthetic file, saved by Word 365 as ODT from the same four-section document as the RTF report; it follows in a comment, with a side-by-side image of the 0.6.1 output.

Source document: four sections on A4.

1. Portrait.
2. Landscape, with page numbering restarting and its own header and footer.
3. Continuous, with two columns.
4. Portrait again.

Expected: the four sections with their orientation, columns, numbering restart and headers/footers.

Actual on main: one section (a single portrait A4 w:sectPr, one column), and no headers or footers at all. The landscape section, the two columns and the restart are lost.

Related: #863 / #873 cover the headers and footers from the master page. This report is about the rest of the section properties: page styles changing between sections, style:columns, and the numbering restart.