Track skill install copy button with X conversions

[pierredotsol]

What

The X conversion event tw-p9ilu-rfmj4 (Install AI Skill) so far fired only for the nav CTA. This PR also fires it when a visitor clicks the copy button of the npx skills add https://github.com/magicblock-labs/magicblock-dev-skill code block in the AI Dev Skill callout (used on 9 pages, incl. the VRF quickstart linked from the X ad).

How

• x-pixel.js: matcher split into isNavigationCta and isInstallCommandCopy. The copy match requires button[data-testid="copy-code-button"] inside a .code-block whose pre code text equals the install command, so other code blocks do not fire.
• Same action name ai_skill_cta_clicked and same payload, so the Worker (workers/x-conversions) is unchanged.
• New browser test: skill-block copy sends one event with matching pixel conversion_id, other-block copy sends nothing.
• README updated.

Checks

npm run check and npm test pass (13 tests). Markup selectors verified against the live Mintlify quickstart page.

🤖 Generated with Claude Code

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: f457e32d-b195-4de1-8e2f-34bccfbd3326

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}