refactor: decompose frontend state and medication dialog flows

frontend/src/features/schedule/storage.ts

@@ -0,0 +1,18 @@
+import { loadCollapsedDaysFromStorage } from "../../utils/storage";
+
+export type ScheduleCollapseState = {
+	collapsed: Set<string>;
+	expanded: Set<string>;
+};
+
+export function loadScheduleCollapseState(collapseKey: string, expandKey: string): ScheduleCollapseState {
+	return loadCollapsedDaysFromStorage(collapseKey, expandKey);
+}
+
+export function saveCollapsedDaySet(storageKey: string, value: Set<string>): void {
+	try {
+		localStorage.setItem(storageKey, JSON.stringify([...value]));
+	} catch {
+		// Ignore storage failures and keep UI responsive.
+	}
+}