feat(html): list numbering and placement from HTML/CSS, footnote style, lists split in cells

[dskripchenko]

What Word's multilevel numbering needs on the print side (printable stage 3), plus fixes found measuring it.

Added

• HTML lists: <ol start>, type / list-style-type (decimal, alpha, roman, none), <li value>, ::marker { content } with strings, counter(list-item), counters(list-item, "."). ListItem::$marker / $value, ListFormat::number().
• Placement by CSS: list padding-left/margin-left (ListNode::$indentPt), item margin-left (ListItem::$indentPt); list and item vertical margins.
• A hanging indent is a tab stop on the first line (as Word): labels are followed by a tab, so text starts on the indent whatever the label width.
• Footnote::$style — the note's own text style at the page foot / in endnotes.
• A list in a table cell splits between items (and inside a nested list) when its row is split across pages, numbering on — a long list no longer carries its whole row to the next page.

Fixed

• <ol start> / type were ignored.
• An item holding only a nested list printed an empty line.

Tests: HtmlListMarkersTest, footnote style; suite 2595 green, phpstan clean, visual regression passes locally. Docs: USAGE en/ru/de/zh, CHANGELOG Unreleased.

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