The Driver rejected v1, which added the hint as its own paragraph above the grid: "you
dont have to add a SECOND HEADER to make this show up... it could be CENTRED on the same
header where it says total 2107." So it now rides the bar that is already there, beside
the live count.
Centred by absolute positioning against the bar, not by flex spacers. The first attempt
here used a spacer on each side and measured 55px off centre at both 1440px and 1280px,
because spacers split the leftover space rather than the bar, and the left cluster
(dock, title, count, selection controls) and right cluster (toast, Export CSV) differ in
width. Absolute at left:50% with translateX(-50%) is relative to the bar itself, so the
clusters cannot drag it, and being out of flow it adds no height by construction.
The bar gains position:relative to be that containing block. pointer-events:none keeps
the hint from intercepting a click meant for a control beneath it, and it hides below
1100px where the clusters leave no free middle.
Measured against a pre-change baseline of 32px: 32px at all three viewports, one header
bar, and centre offset 0 at 1440px and 1280px.
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