getFieldMappings/getConfigCategories fetched host-GENERATED files with
default caching, so a browser that had the page open before a release
kept rendering the previous release's config UI — a newly shipped field
(UPDATE_TYPE) simply never appeared, with nothing on screen to hint the
page was stale. Only a hard refresh fixed it.
Adds {cache:'no-store'} to both, plus the one configs.json read in this
file that was missing it while two others already had it. Cost is a
conditional request per config-page open.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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