ychat: fix clipped mobile input link row (96px was measured short)

The 96px .chatlayout-bottom height on narrow screens was sized from
desktop CSS math, but real mobile browsers render form controls taller
than that math assumed. Verified with a headless-Chrome screenshot of
input.html inside a same-size iframe: at 96px the link row (Colors/
Options/Help/.../Logout + scroll checkbox) was clipped entirely below
body.inputframe's overflow-y:auto fallback -- present in the DOM but
invisible without an undiscoverable scroll inside a tiny strip, which
is what showed up as "cramped" in a real phone screenshot. Re-verified
at several heights the same way; 120px fits both rows with room to
spare.

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