Add Cloudflare Workers AI chat assistant to homepage

[Copilot]

Adds EduBot, a floating AI chat widget on the homepage backed by Cloudflare Workers AI (@cf/meta/llama-3.1-8b-instruct), so users can ask questions about the platform and learning activities without leaving the page.

Backend — POST /api/chat

• New endpoint in src/worker.py accepting { message, history[] }
• Forwards to env.AI.run() with an EduPlatform-scoped system prompt
• Sanitises and caps conversation history (10-turn window, 2000-char per message)
• Returns 503 on AI service failure; wrangler.toml gains the required [ai] binding

result = await env.AI.run(
    "@cf/meta/llama-3.1-8b-instruct",
    {"messages": messages},
)

Frontend — floating chat widget (public/index.html)

• Fixed bottom-right 💬 toggle button; opens a branded chat window (EduBot header, scrollable message log, typing indicator)
• Vanilla JS maintains client-side history, sends prior turns as history[] and current message as message on each request
• Accessible: role="log", aria-live="polite", aria-label on controls

Screenshots

Chat button (collapsed)

Chat window open

Original prompt

---

This section details on the original issue you should resolve

<issue_title>setup a cloudflare ai bot so users can chat with a bot from the homepage</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes setup a cloudflare ai bot so users can chat with a bot from the homepage #8

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[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	learn	d34ea61	Commit Preview URL Branch Preview URL	Mar 22 2026, 05:16 PM