Fold the header menu into a button when its links do not fit

A long menu wrapped onto two or three lines on phones and narrow
windows. With the new Design switch the header menu folds into a ☰
button (an icon, the word Menu, or both) carried by the title or logo
block just above it, at the right end of its row, or by the menu bar
when nothing is above it; the button opens the links as a stacked list
with the search box on top.

The open/closed state is a hidden checkbox and the button its label,
so opening needs no script and works in old browsers. Whether to fold
is decided by a small inline script — any link on a second line means
the menu does not fit — re-checked on resize; without it blog.css folds
on phones only, and browsers too old for that keep the wrapping menu.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

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