fix: promote display math blocks from mixed paragraphs

[hryhoriiK97]

What/Why?

Display math ($$...$$) on a line directly after text (no blank line) was rendered as plain text. md4c merges such content into a single Paragraph, and the existing unwrap logic only handled the pure case (all children are display math). Extended it to also split mixed paragraphs — keeping the leading text in place and promoting trailing display math blocks to top-level siblings.

Testing

export const sampleMarkdown = `
Based on the image provided, we can solve the quadratic equation as follows:

### 1. Identify the coefficients
For a quadratic equation in the form $ax^2 + bx + c = 0$, we have:
- $a = 1$
- $b = -3$
- $c = 2$

### 2. The Quadratic Formula
We use the standard formula for finding the roots:
$$x = \\frac{-b \\pm \\sqrt{b^2 - 4ac}}{2a}$$

### 3. Substitution & Calculation
Substitute the values into the formula:
$$x = \\frac{-(-3) \\pm \\sqrt{(-3)^2 - 4(1)(2)}}{2(1)}$$
$$x = \\frac{3 \\pm \\sqrt{9 - 8}}{2}$$
$$x = \\frac{3 \\pm \\sqrt{1}}{2}$$

### 4. Final Results
Simplified, we get two possible values for $x$:
- $x_1 = \\frac{3 + 1}{2} = 2$
- $x_2 = \\frac{3 - 1}{2} = 1$

**Solution set: $\\{1, 2\\}$**
`;

Screenshots

iOS	Android

PR Checklist

• Code compiles and runs on iOS
• Code compiles and runs on Android
• Updated documentation/README if applicable
• Ran example app to verify changes

[ppaanngggg]

Amazing! Thank you so much for that fix. Will it be fixed in the next release?

[hryhoriiK97]

Amazing! Thank you so much for that fix. Will it be fixed in the next release?

Yes, it will be included in version 0.5.0. In the meantime, you can test this using the react-native-enriched-markdown@nightly release.