The mobile preferences modal split CombinedModelSelector's onSelect into
separate onSelectProvider and onSelectModel calls, but onSelectProvider
was never passed from DraftAgentStatusBar — so selecting a non-cloud
provider was silently ignored while only the model ID updated.
Add onSelectProviderAndModel prop to ControlledStatusBar and use it on
the mobile path, matching the web path's atomic behavior.
e01a0abdf2