docs: clarify conditional formatting behavior under column pivots

[igorlukanin]

Summary

Documents how conditional-formatting rules behave under a column pivot in the table visualization: a row-spanning rule (Entire row / Selected columns) styles each measure cell by its own pivot combination's value, and leaves cells with no single value to test — row headers, row dimensions, and rules sourced on a dimension pivoted into columns — unstyled.

Adds one short paragraph to the Conditional formatting section of the table chart page.

Test plan

• Prose only; renders in the Conditional formatting section of explore-analyze/charts/chart-types/table.mdx

[claude]

Claude finished @igorlukanin's task in 27s —— View job

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Review

Docs LGTM — 1 low (readability nit)

• Read PR diff
• Review the added prose

Change under review — docs-mintlify/docs/explore-analyze/charts/chart-types/table.mdx:276, a single paragraph clarifying conditional-formatting behavior under column pivots.

Assessment: Content is accurate and complements the existing Conditional formatting section. Prose-only, no code impact, no tests needed.

Minor readability nit (non-blocking): the second sentence is long (~50 words) and stacks a parenthetical, a because-clause, and the rule outcome. Splitting after the parenthetical would improve scannability, e.g.:

Under a column pivot, a row spans several values of the same measure — one per pivot combination. A row-spanning rule (Entire row or Selected columns) styles each measure cell by its own combination's value. Cells with no single value to test — row headers, row dimensions, and any rule whose source dimension has been pivoted into columns — are left unstyled.

Also consider hyphenating row-spanning on first use for consistency (already used later in the sentence).

Nothing blocking. Ship it.

• [Branch](https://github.com/cube-js/cube/tree/igor/cub-3058-cf-under-pivot-docs)

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