Mobile nav — float menu + search as bottom-right…

Details

On phones the section links overflowed the bar and pushed the hamburger
and ⌘K off-screen (horizontal scroll to reach them): the priority+
overflow check never fired because the row grew the page instead of
clipping. Below 700px, force all links into the menu and float the menu
(hamburger) and search as thumb-reachable circular FABs in the bottom-
right above the dock, per the mobile FAB / thumb-reach pattern. Desktop
unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YB1axhX3kbHCFJbX7LhfH8

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