The shelf is laid out in the width the wall reports, and that width was read
once, by the effect that watches the wall's own element. The phone's layout
stands where the wall does, so a visit that opens on the phone mounts the wall
with nothing to measure: the effect returned with the width still nought and
never ran again, and every row of the shelf was laid out one pixel wide — a
library of blank boxes until another render made that effect run (SINGLE and
ALL THUMBS are two of them, which is why the toggle brought the pictures back).
It is read after every render now, the way the window of rows the wall draws
already is (see `useWallWindow`), and the effect keeps the resizing itself.
Measured on 8090, phone 390 handed to the desk: the tiles were 1x1 px and are
now 85x113 (and 120x160 at 1440), all loaded, nothing left in `.lib-noimg`.
3dtours
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