'plugin-react-swc' -> 'plugin-react' (#168)

I upgraded several dependencies yesterday, including vite. Running `pnpm
run dev:frontend` now prints:
> [vite:react-swc] We recommend switching to `@vitejs/plugin-react` for
improved performance as no swc plugins are used. More information at
https://vite.dev/rolldown

So in this PR I switch to `@vitejs/plugin-react`. Unless you had a
specific reason to use `@vitejs/plugin-react-swc` instead?

apps/frontend/package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "@types/react": "19.2.14",
     "@types/react-dom": "19.2.3",
-    "@vitejs/plugin-react-swc": "4.3.0",
+    "@vitejs/plugin-react": "6.0.1",
     "clsx": "2.1.1",
     "tailwindcss": "4.2.2",
     "vite": "catalog:default",

apps/frontend/vite.config.ts

@@ -1,7 +1,7 @@
 import path from "node:path";
 
 import tailwindcss from "@tailwindcss/vite";
-import react from "@vitejs/plugin-react-swc";
+import react from "@vitejs/plugin-react";
 import { defineProject } from "vitest/config";
 
 // https://vitejs.dev/config/