Improve website accessibility baseline

[vahid-ahmadi]

What changed

• implements roving tabindex for both connector and model tablists
• adds Arrow Left/Right, Home, and End keyboard behavior with focus movement
• connects tabs and panels with stable IDs, aria-controls, and aria-labelledby
• adds a visible mobile cue for the horizontally scrollable Economy topic navigation
• fixes the Contact page heading hierarchy
• adds missing Open Graph metadata to Models and Contact

Why

The tab controls were click-only and put every tab in the normal Tab sequence. The mobile Economy navigation hid most destinations without communicating that it scrolls, and two public pages lacked baseline structural or sharing metadata.

Validation

• local browser: Arrow Right selected and focused ChatGPT, with one tab stop
• local browser: End selected and focused pe-microsim, with one tab stop
• local browser: corresponding tab panels became visible
• local 390px screenshot confirms the Economy swipe cue
• 11 site-contract tests passed
• generated Economy, navigation, charts, and notes checks passed
• no browser error overlay detected

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
macromod	Ready	Preview, Comment	Jul 26, 2026 1:48pm