Desktop had no way to read or change the shared-metrics opt-ins. The new
profile-scoped RPCs read/write telemetry.shared_metrics.{enabled,send} in the
focused profile's config.yaml through the one config writer, keep the setup
wizard's invariant (send is forced off unless collection is on) and reconcile
the consent windows on every change via the wizard's own helper. first_run
answers also record the desktop setup-completed metric (lazy import until the
events module lands).
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