fix(math): propagate paragraph spacing to display math blocks (SD-2409)

[caio-pizzol]

Display math paragraphs (m:oMathPara) were rendering with no vertical spacing — text and equations were cramped together. Word shows proper breathing room because the containing w:p paragraph's spacing properties apply.

The root cause: when mathBlock is hoisted out of its parent w:p during import, the paragraph's spacing properties were dropped. The layout engine saw zero spacing.

Fix: thread paragraphProperties from the parent w:p through the mathBlock PM node, then resolve them in the pm-adapter via computeParagraphAttrs — same as regular paragraphs.

• Importer: capture paragraphProperties from extraParams on mathBlock attrs
• PM schema: add paragraphProperties attribute to mathBlock
• pm-adapter: call computeParagraphAttrs to resolve spacing, borders, indent
• Tests: importer passthrough + pm-adapter spacing resolution + alignment fallback

SD-2409

[linear]

SD-2409 Math display paragraphs missing pre/post spacing

[github-actions]

Status: PASS

The PR's OOXML changes are spec-compliant. Here's what I checked:

Elements and attributes used:

• m:oMathPara, m:oMathParaPr, m:jc (with m:val) — all valid OOXML math elements per §22.1.2.79 and §22.1.2.51
• m:oMath, m:r, m:t — valid per §22.1.2.87 and §22.1.2.116
• The paragraphProperties attribute is an internal carrier (not an OOXML construct) that ferries already-parsed w:pPr data between pipeline layers — no spec concern there

Default value for m:jc: The spec (§22.1.2.51) says the default when m:jc is absent is centerGroup, and the code correctly returns 'centerGroup' on lines 12 and 14. ✓

One pre-existing issue worth noting (not introduced by this PR, but in the touched file):

Line 15 of math-importer.js:

return jc.attributes['m:val'] || 'center';

When m:jc is present but m:val is an empty string, this falls back to 'center'. But the spec says the default in that case is also centerGroup. Should be || 'centerGroup'. See https://ooxml.dev/spec?q=jc+justification+math for the relevant clause. Minor edge case since a well-formed document won't have an empty m:val, but worth fixing.

[chatgpt-codex-connector]

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