Mobile devices use different monospace fonts (Courier on iOS, Droid Sans Mono
on Android) with larger ascent/descent metrics than desktop fonts. With
lineHeight: 1.0, calculated cell height was smaller than actual glyph height,
causing block characters to render at ~3/4 height. Increasing to 1.2 gives
mobile fonts proper vertical space while maintaining desktop compatibility.
Quality gates: TypeScript check passed, production build successful
Alex Blank
76fbf0a755