feat(ios): add HTML renderer

[patrickkabwe]

closes #93 #67

Summary

• add HTML/plaintext renderer with CSS parsing and NitroText renderer prop
• update example app with PlainText/HTML/Performance tabs
• expand iOS/C++ fragment handling and refresh bindings; lockfile updates

Usage

import { NitroText } from 'react-native-nitro-text'

const html = `
 <style>
  .link { color: blue }
</style>
  <div>
    <h2>Renderer demo</h2>
    <p>This text comes from <strong>HTML</strong> with <em>semantic</em> tags.</p>
    <p><span style="color: #ff6347; font-weight: bold;">Inline CSS works too.</span></p>
     <a href='x' class='link'>hello</a>
  </div>
`

export function HtmlExample() {
  return <NitroText renderer="html">{html}</NitroText>
}

Testing

• not run (run bun test and try example app)