The Driver asked for a top-right dropdown with Auto plus fixed overrides,
remembered, and said plainly that the CSS already working must not break.
So Auto writes NOTHING. The grid is repeat(auto-fill, minmax(240px, 1fr)),
which already gives one column on a phone and three to five on a desktop by
measuring its container; Auto leaves the stylesheet alone and only an explicit
override sets grid-template-columns. An Auto that computed a number and wrote
it back would look identical until the container resized, and then be silently
wrong — the same picture, with the responsiveness removed.
An override is honoured even when it is a poor idea: five columns on a 390px
phone is a 62px card. That is deliberate. The reader asked for it, Auto is the
default and one click away, and the control shows which is active. Clamping
someone's explicit choice to what we think is sensible is how a control stops
being trusted.
It is remembered per PROFILE, not per bundle. Two grids on one page are two
different lists, and useDashboardLayout already paid for that lesson when a
shared key made one caller inherit another's saved layout. Blocked storage is
caught and ignored: in private mode the default is the correct outcome, not an
error to report.
It sits in its own row rather than in #filters, which is gated on
useSearch || useFilters — a host turning both off would otherwise lose a control
that has nothing to do with either. It modifies the grid, so it lives on the
grid.
Both strings are authored in all eleven catalogues, in the snake_case this
catalogue uses: a camelCase key here would have resolved to nothing and rendered
its own name, which is the defect I shipped in a legend earlier today.
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