react-native-enriched-markdown inline math repro

Minimal iOS reproduction for inline math alignment behavior in react-native-enriched-markdown.

It renders small fixed-height rows with red center lines so inline math placement can be compared against plain text and other formulas.

What this shows

The app is useful for two related iOS checks:

1. Attachment font attributes: inline math is rendered as an NSTextAttachment. In the current 0.7 nightly, the attachment string is missing NSFontAttributeName, so the package's paragraph line-height baseline-offset pass does not apply consistently to math attachments.
2. Shallow formula residual: after the font-attribute fix, larger formulas such as fractions and sums align much better, but shallow zero-depth formulas such as $2\pi$ can still look optically low compared with plain text.

Run

npm install
npm run ios

The repro currently uses:

• react-native-enriched-markdown@0.7.0-nightly-20260627-4e5ceb7c3
• react-native@0.85.3
• expo@~56.0.12

The nightly version is intentional: current 0.7 code applies applyBaselineOffset(...) after applyLineHeight(...) in ios/renderer/ParagraphRenderer.m. That helper in ios/utils/ParagraphStyleUtils.m reads NSFontAttributeName to compute the font line height and add NSBaselineOffsetAttributeName. This repro focuses on the inline math attachment missing that font attribute, not the older pre-0.7 line-height behavior.

Screenshots

Font-attribute comparison

This compares the current nightly with the same app after adding the active NSFontAttributeName to the inline math attachment string.

Shallow formula residual

This highlights the remaining $2\pi$ visual offset after the font-attribute patch. It is separate from the missing-font-attribute issue.