Bumps the desktop/mobile split from Tailwind's md (768 px) to a
custom min-[1100px] threshold so tablets and small laptops get the
mobile chrome (menu button + bottom-right floating cluster) instead
of an over-cramped desktop nav. Bottom-clearance spacers on Home and
Shop track the same threshold so they don't disappear before the
floating cluster does.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>