SVG icons with explicit width/height attributes rendered tiny because
max-width/max-height only caps intrinsic size and never scales up, while
dimensionless SVGs defaulted large and were capped to 60px. Pin .app-icon
to a fixed 60x60 box with object-fit: contain so every icon renders at a
consistent size while preserving aspect ratio.
Fixes#1582
KodeStar
91f7a2ec8d
