Add extensive form tests and enhanced error handling for auth components.

- Introduced comprehensive tests for `RegisterForm`, `PasswordResetRequestForm`, and `PasswordResetConfirmForm` covering successful submissions, validation errors, and API error handling.
- Refactored forms to handle unexpected errors gracefully and improve test coverage for edge cases.
- Updated `crypto` and `storage` modules with robust error handling for storage issues and encryption key management.
- Removed unused `axios-mock-adapter` dependency for cleaner dependency management.

frontend/jest.setup.js

@@ -1,8 +1,14 @@
 // Learn more: https://github.com/testing-library/jest-dom
 import '@testing-library/jest-dom'
-import 'whatwg-fetch'; // Polyfill fetch API for MSW
+import 'whatwg-fetch'; // Polyfill fetch API
 import { Crypto } from '@peculiar/webcrypto';
 
+// Polyfill TransformStream for nock/msw
+if (typeof global.TransformStream === 'undefined') {
+  const { TransformStream } = require('node:stream/web');
+  global.TransformStream = TransformStream;
+}
+
 // Mock window object
 global.window = global.window || {};