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Book cards on the library (all-books) page were oversized at full window width, and both the all-books and series grids showed only 2 columns on phones, making covers unnecessarily large on mobile. Shift the all-books column ladder up one at every breakpoint (2/4/5/6 -> 3/5/6/7) so the responsive reflow the grid is liked for is preserved while every window size gets smaller cards; the series grid gains a column at mobile only (2 -> 3), leaving md/lg untouched per request. Dashboard carousel sizing (w-36/w-40) and the series stacked-covers component are deliberately unchanged. templ codegen and the tailwind build output commit with the source change that produced them (repo convention).