Layer two new optional keys on top of the existing User.sourcePriorityJson
shape — metricPriority (nested per-metric ladder, canonical going forward)
and deviceTypePriority (default ladder plus per-metric overrides). The
W5e flat top-level metric keys stay accepted as a backward-compat alias
so existing rows keep working without a DB migration or forced reconfig.
parseSourcePriority() now returns a fully-resolved shape where every
metric ladder is defaulted and the device-type axis defaults to the
documented DEFAULT_DEVICE_TYPE_PRIORITY (watch first). Two helpers
(getSourceLadder, getDeviceTypeLadder) centralise the lookup so the
picker, the UI and downstream call sites share one path.
Tests: 30 unit tests pass (up from 19). Covers both axes' parse,
fallback chain (W8c nested > W5e flat > defaults), enum guards, and
the two helper functions.
Pre-existing typecheck failures unrelated to this change:
src/lib/i18n/* and a handful of consumers expect a 'de' | 'en' locale
union but i18n config declares the 6-locale superset.
Marc-André Bombeck
f05c55f638