Fixes #261: Implement Vite + Tailwind v4 Preview App Agent Skill

[davideast]

Fixes #261

This PR introduces a new Agent Skill in packages/sdk/examples/vite-preview/ that teaches an AI agent how to integrate a UI design generated by the Stitch SDK into a Vite + React application using Tailwind CSS v4.

Changes include:

• Added SKILL.md detailing the required capabilities, manual steps for the agent, and instructions for scaffolding a Vite app.
• Created the utility script scripts/extract-theme.ts to extract the embedded Tailwind configuration from a Stitch HTML file and convert it into a Tailwind v4 @theme CSS block.
• Added README.md providing an overview and usage instructions for the skill.
• Updated the main SDK README.md to link to the new example in an Examples section.

---

PR created automatically by Jules for task 3845032841093632648 started by @davideast

---

⚠️ Closed by fleet-merge: batch conflict resolution dispatched (session 12887552735879190071).

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[jules-fleet]

🔄 Batch conflict resolution in progress

This PR is part of a batch being resolved together: #270, #271, #272, #273, #274, #275, #276, #277, #278, #279, #280, #281, #282, #283, #284
A Jules session has been dispatched to create a combined PR that resolves all conflicts.

Session: 12887552735879190071