A page counts as unread only when another author changed it last: the author of
its latest modified object (AuthorMostRecent) is compared with the user name edits
are stored under and the account's name, so changes made on another of the
reader's computers, OneNote 2010's included, are not marked. A page the reader
changed last also stops being unread. `stored_pages` now names each page's latest
author.

What is unread shows an accent dot at the start of its row, as Mail marks unread
mail, in place of OneNote's bold: page tabs, section tabs and the sidebar's
sections, groups and notebooks. Page tabs leave room for it, so labels stay put.

Assisted-by: claude-opus-5.5