chore: minify html for production build (@fehmer) (monkeytypegame#6413)

Author: fehmer

frontend/package.json

@@ -65,6 +65,7 @@
     "vite-plugin-filter-replace": "0.1.13",
     "vite-plugin-html-inject": "1.1.2",
     "vite-plugin-inspect": "0.8.3",
+    "vite-plugin-minify": "2.1.0",
     "vite-plugin-pwa": "0.20.0",
     "vitest": "2.1.9"
   },

frontend/vite.config.prod.js

@@ -11,6 +11,7 @@ import { writeFileSync } from "fs";
 // eslint-disable-next-line import/no-unresolved
 import UnpluginInjectPreload from "unplugin-inject-preload/vite";
 import { readdirSync, readFileSync, statSync } from "node:fs";
+import { ViteMinifyPlugin } from "vite-plugin-minify";
 
 function pad(numbers, maxLength, fillString) {
   return numbers.map((number) =>
@@ -85,6 +86,7 @@ export default {
       },
     }),
     splitVendorChunkPlugin(),
+    ViteMinifyPlugin({}),
     VitePWA({
       // injectRegister: "networkfirst",
       injectRegister: "script-defer",