Function fanOut

src/utils/settings/changeDetector.ts:437–440

* Reset the settings cache, then notify all listeners. * * The cache reset MUST happen here (single producer), not in each listener * (N consumers). Previously, listeners like useSettingsChange and * applySettingsChange reset defensively because some notification paths * (file-watch at :289/340

(source: SettingSource)

 * repopulates; all subsequent listeners hit the cache.
 */
function fanOut(source: SettingSource): void {
  resetSettingsCache()
  settingsChanged.emit(source)
}

/**
 * Manually notify listeners of a settings change.