The previous mobile fix put the title on its own row but left the
search input as a regular flex item (flex:1 1 140px) among PDF/
"Вкладки"/"Меню". Since it greedily grows to fill whatever line it
lands on, it still forced PDF onto its own line, then itself onto the
next, then the two remaining buttons onto a third - three staggered
rows instead of the intended toolbar.
Gives the search input its own full-width row (flex-basis:100%,
order:0) and puts all catalog-head buttons (PDF, "Вкладки", "Меню") on
the next row together, sharing it evenly (flex:1 1 0) so they land on
one level instead of scattering.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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