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