Build synchronized accessible simulation views

[maximalfocus]

Summary

• add synchronized timeline, fictional infrastructure, and activity-feed views
• add event selection and named play, pause, previous, next, and restart controls
• expose textual provenance, non-color access symbols, accessible labels, and simulation disclaimer
• add responsive presentation and narrow-screen layouts

Verification

• npm test — 8 tests passed
• npm run typecheck — passed
• npm run lint — passed
• npm run build — passed
• git diff --check — passed

Closes #3