add more ux and ui patches with extra login helper

frontend/src/lib/shortcut.ts

@@ -0,0 +1,26 @@
+export type Shortcut = {
+	famSlug: string;
+	famName: string;
+	userName: string; // '' for parents (no handle in URL)
+};
+
+const KEY = 'fam_shortcut';
+
+export function recordShortcut(entry: Shortcut) {
+	if (typeof localStorage === 'undefined') return;
+	localStorage.setItem(KEY, JSON.stringify(entry));
+}
+
+export function readShortcut(): Shortcut | null {
+	if (typeof localStorage === 'undefined') return null;
+	try {
+		const raw = localStorage.getItem(KEY);
+		return raw ? (JSON.parse(raw) as Shortcut) : null;
+	} catch {
+		return null;
+	}
+}
+
+export function shortcutTarget(s: Shortcut): string {
+	return s.userName ? `/${s.famSlug}/${s.userName}` : `/${s.famSlug}`;
+}