Every grid cell downloaded the full detail sprite. Generate a smaller
/sprites-grid/v1/ set at build time and let the grid ask for those first,
falling back through the existing detail URLs when a thumbnail is missing so
detail resolution is unchanged. The new prefix is versioned, so it can be cached
forever, and the service worker recognises it alongside the other sprite roots.
The placeholder is now an empty box rather than a spinner: a thousand spinners
cost layout work and announced nothing useful.
Sprites were shipped at 512x512 but render at 44-64px in the box grid.
Resizing to 192px halves each file (median 15.5KB -> 7.6KB); a full dex
of artwork drops from 16.6MB to 7.6MB.
The sprite build now also writes static/sprites-small/manifest.json,
listing every sprite (all forms, shiny and female variants) with its
size, so the offline worker can save the complete set and report what
is missing. A unit test keeps it in step with the files on disk.
`prettier --check .` failed on 22 files, so gating CI on `npm run lint` was
never going to pass. These changes are whitespace only.
Adds the two remaining generated data exports to .prettierignore so this class
of churn cannot recur, along with machine-local settings files.
Josh Creek