adds “save all state” utility

src/lib/utility/use-state.ts

@@ -0,0 +1,12 @@
+import { episode_progress } from '$lib/context/episode-progress';
+import { user_preferences } from '$lib/context/user-preferences';
+
+export function save_podcast_state() {
+	episode_progress.save_all();
+	user_preferences.save();
+}
+
+export function load_podcast_state() {
+	episode_progress.load_all();
+	user_preferences.load();
+}