4e23824d

By: Michael Lynch <git@mtlynch.io>

Track full-size media widths

Store each generated full-size file's measured width with its media metadata.
Make FullSize a MediaFileVariant so callers receive both its filename and
width, and inspect converted output before writing it to the media backend.
configuredevShellx86_64-linuxbackendbackend-devcheck-bashcheck-frontendcheck-go-formattingcheck-go-test-packagescheck-trailing-newlinecheck-trailing-whitespacedeploy-to-flydiagramdocker-imagee2e-testsgo-testsimport-from-tinybeansjs-testslint-sqllittle-momentslittle-moments-devx86_64-linux