web: pin settings/download to the top-right corner, never wrap it down

Per the target layout: the utility cluster (settings + the pobierz
disclosure) must hold the top-right corner on the same row as the reader
link, not drop onto a second full-width line below the controls.

Make #controls itself non-wrapping so the side cluster keeps the corner;
the left controls (.controls-main) absorb any tightness by wrapping their
OWN items onto a further line (min-width:0 lets them shrink). At the
64rem page width the whole bar cannot fit every left control AND the
corner cluster on one line, so a trailing control (layout) wraps beneath
-- the intended block-on-the-left, cluster-in-the-corner shape. A tighter
column gap buys a little room; on phones (<=40rem) the bar wraps normally.

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