feat: add architecture page

[cowan-macady]

implement ENG-8488

add architecture page
add some style modifications

[deepsource-io]

DeepSource Code Review

We reviewed changes in 10eb51b...8544c92 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Secrets		Sep 1, 2026 11:37a.m.	Review ↗
Python		Sep 1, 2026 11:37a.m.	Review ↗

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[Copilot]

Pull request overview

Adds a new “Architecture” static page to the a2a/iag-mcp-demo console and updates the chatbot UI to better support streaming/chat readability and multi-line prompts.

Changes:

• Introduces /static/architecture.html with an inline SVG diagram and lightweight JS to badge the active usecase and dim optional profile-gated groups.
• Exposes usecase and profiles via /api/config (fed from USECASE / COMPOSE_PROFILES) and wires those env vars into docker-compose.yaml.
• Updates the console UI (new header link + user chip, textarea input with autosize, message metadata, style tweaks).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
a2a/iag-mcp-demo/README.md	Documents the new Architecture page behavior and how it reflects /api/config.
a2a/iag-mcp-demo/docker-compose.yaml	Adds USECASE / COMPOSE_PROFILES env for the console to report active context/profiles.
a2a/iag-mcp-demo/chatbot/static/styles.css	UI/layout tweaks (wider container, sidebar sizing, message meta, textarea styling, loading indicator styles).
a2a/iag-mcp-demo/chatbot/static/index.html	Adds Architecture link + user chip; textarea + autosize; message meta labels/timestamps; streaming safeguards.
a2a/iag-mcp-demo/chatbot/static/architecture.html	New self-contained architecture diagram page with profile dimming via /api/config.
a2a/iag-mcp-demo/chatbot/app.py	Adds USECASE / COMPOSE_PROFILES to config output and returns a display username in auth status.

Suppressed comments (1)

a2a/iag-mcp-demo/chatbot/static/index.html:334

• keypress is deprecated and can behave inconsistently for Enter on some platforms/IME input. Prefer keydown, and skip handling while the user is composing text (IME) to avoid accidental sends.

    messageInput.addEventListener('keypress', (e) => {
        if (e.key === 'Enter' && !e.shiftKey) {
            e.preventDefault();
            sendMessage();
        }
    });

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Copilot wasn't able to review any files in this pull request.