Fix runtime errors: PerformanceObserver, localStorage, crypto.randomUUID, hydration issues, and linting errors

lib/useWebVitals.ts

@@ -324,7 +324,7 @@ export const useWebVitals = () => {
       observers.forEach(observer => {
         try {
           observer.disconnect();
-        } catch (error) {
+        } catch {
           // Silently fail
         }
       });