Desktop love/hate telemetry needs a backend half: six counters
(feature_use, action_use, mode_use, friction, dislike, onboarding) with
closed dimension sets, the v3 JSON schema entries, the public doc rows,
and profile-scoped gateway RPCs the app reports through.
Every value the app sends is collapsed server-side onto the closed set
(unknown -> other); feature use latches per area per UTC day, friction
and dislike are capped per day, the daily report (action counts + mode
time + bot count) latches per day and answers recorded=false on a store
failure so the app keeps the day for a retry. For setting changes the
app sends only the config key: the backend reads the saved value and
compares it to DEFAULT_CONFIG itself, so values never cross the wire;
keys outside DEFAULT_CONFIG read other. All helpers check enabled()
before doing any work.
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