feat: add MyExams, MyResults, Settings, and Workspace components

- Implemented MyExams component for managing user exams, including loading, deleting, and creating new exams.
- Created MyResults component to display user results with options to review and delete results.
- Developed Settings component for updating user display name and changing password.
- Introduced Workspace component to serve as a container for MyExams, MyResults, and Settings, with navigation between tabs.

frontend/vite.config.ts

@@ -1,9 +1,8 @@
 import { defineConfig } from "vitest/config";
-import react, { reactCompilerPreset } from "@vitejs/plugin-react";
-import babel from "@rolldown/plugin-babel";
+import react from "@vitejs/plugin-react";
 
 export default defineConfig({
-  plugins: [react(), babel({ presets: [reactCompilerPreset()] })],
+  plugins: [react()],
   server: {
     proxy: {
       "/api": {