pub const SAFE_RADIUS: f32 = 0.49;Expand description
Everything an icon draws stays inside this radius, as a fraction of the tile’s width — the tile’s own inscribed circle, less a hair.
Not a stylistic margin: uploaders that show a square icon in a round
frame crop to exactly this circle, so anything outside it is a mark
that some places show and others silently cut. One layout satisfies
both frames, which is why a round icon here is the same mark as the
square one with a different crate::paint::Cut rather than a mark of
its own.