Verify physical devices, actual zoom and visual accessibility #7

Viewport emulation and screenshots support the implementation but do not replace actual-device/zoom review.

• Test real mobile touch devices, landscape, safe areas and large system fonts.
• Test actual browser zoom at 200% and 400%, including every control and panel scrolling.
• Test light/dark/custom global CSS, forced colors and reduced motion.
• Confirm visible focus/selection and control contrast; closed widget must not intercept adjacent host interactions.
• Record exact platforms/results and repair confirmed failures.

Acceptance: manual evidence and usable controls without clipping, gesture interception or inaccessible states.

References: roadmap, development/acceptance guide.