Nav: credit the priority+/GreedyNav origin; keep…

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Evaluated replacing the hand-written overflow logic with a known package (per
request). Verdict, unanimous across a 3-lens research pass: no vendorable vanilla
priority+ library fits. The ones you can drop in as a global script (priority-nav,
priority-plus) GENERATE their own second hamburger and measure viewport width;
the only one that reuses an existing toggle (lukejacksonn/GreedyNav) is
unmaintained jQuery with no ARIA and no UMD build. This function already IS the
vanilla, accessible port of that exact greedy pattern — so a package would be a
regression on markup-fit, a11y, or dependencies. Documented the pattern's origin
in the function comment instead.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014c7dbCGbQxtWedKRSx4sJi

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