azd up fails due to unresolved module aliases like '@/lib/utils' in frontend

When running `azd up`, the frontend build step fails with errors like:

error TS2307: Cannot find module '@/lib/utils' or its corresponding type declarations.

This seems to be due to missing or incorrect `paths` configuration in `tsconfig.json`. To fix this, adding the following to `frontend/tsconfig.json` under `compilerOptions` resolves the issue:

```json
{
"compilerOptions": {
"baseUrl": ".",
"paths": {
"@/*": ["src/*"]
}
}
}