feat(ods): a column's default cell style reaches its cells

[productdevbook]

LibreOffice puts a column's format on the column, not on its cells:

<table:table-column table:default-cell-style-name="ce1"/>

where ce1 names the data style. A date column's yyyy-mm-dd lives there and nowhere else — the cells themselves say table:style-name="Default", a named style in styles.xml that this reader does not open.

hucre read neither, so a LibreOffice document came back with its values and none of its formats.

What is reachable, and what is not

The column default is an automatic style in content.xml, which this reader does parse — so that half is reachable, and is what this reads.

A column naming a style from styles.xml still resolves to nothing. That is the right answer for the one LibreOffice actually writes there — "Default", on the columns it did not format — since that style is the absence of formatting. PARITY.md records both halves.

Precedence and counting

• A cell's own style still wins; the column only fills in for cells that named none.
• A covered cell advances the column count too, or every default after a merge would land one column to the left.

This was the last open item

It was in the ODF grammar, in libreoffice-basic.ods, and nowhere in src/. Both halves of SPEC-COVERAGE.md now read "Nothing" under not yet looked at, and no item is marked open.

Output still validates against the OASIS grammar (validate-odf.mjs: all parts valid).

pnpm test green — 10,583 tests, 234 files.

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