init: add source code from src.zip

src/hooks/useSettings.ts

@@ -0,0 +1,17 @@
+import { type AppState, useAppState } from '../state/AppState.js'
+
+/**
+ * Settings type as stored in AppState (DeepImmutable wrapped).
+ * Use this type when you need to annotate variables that hold settings from useSettings().
+ */
+export type ReadonlySettings = AppState['settings']
+
+/**
+ * React hook to access current settings from AppState.
+ * Settings automatically update when files change on disk via settingsChangeDetector.
+ *
+ * Use this instead of getSettings_DEPRECATED() in React components for reactive updates.
+ */
+export function useSettings(): ReadonlySettings {
+  return useAppState(s => s.settings)
+}