Fix settings validation and session errors

src/types/auth.ts

@@ -84,7 +84,7 @@ export interface AuthSession {
   user_agent: string | null;
   ip: string | null; // Pre-hashed by database function
   not_after: string | null;
-  aal: AALLevel | null;
+  aal: string | null; // Changed to string to match get_my_sessions() return type
 }
 
 /**