[jaromil]

Summary

• extract and document shared frontend design primitives
• improve semantic structure, keyboard focus, chat accessibility, and responsive behavior
• provide accessible dashboard data states and vendor Chart.js for offline-safe delivery
• consolidate stale UI CSS, deployment example behavior, and durable design documentation

Verification

• npm run check:web (31 passing)
• cmake --build --preset native-gcc
• ctest --preset native-gcc --output-on-failure (3 passing)
• npx playwright test (2 passing)
• scripts/run-static-analysis.sh
• git diff --check