add toggle fix and possible log out issue

frontend/src/lib/shortcut.ts

@@ -15,7 +15,17 @@ 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;
+		if (!raw) return null;
+		const s = JSON.parse(raw) as Shortcut;
+		// Self-heal the old poisoned entry: a write that fell back to
+		// page.params.fam while page.data.fam was null stored the PB id as
+		// both slug and name ({famSlug: id, famName: id}). A real slug is
+		// never identical to the display name AND a 15-char PB id.
+		if (s && s.famSlug === s.famName && /^[a-z0-9]{15}$/.test(s.famSlug || '')) {
+			localStorage.removeItem(KEY);
+			return null;
+		}
+		return s;
 	} catch {
 		return null;
 	}