Remove unused frontend test framework

vitest, @vue/test-utils, jsdom and @types/jsdom were installed but no
frontend tests exist or are planned. Removing them also drops the
deprecated glob@10 dependency chain (js-beautify). type-check now uses
tsconfig.app.json.

frontend/tsconfig.node.json

@@ -1,12 +1,6 @@
 {
   "extends": "@tsconfig/node18/tsconfig.json",
-  "include": [
-    "vite.config.*",
-    "vitest.config.*",
-    "cypress.config.*",
-    "nightwatch.conf.*",
-    "playwright.config.*"
-  ],
+  "include": ["vite.config.*"],
   "compilerOptions": {
     "composite": true,
     "module": "ESNext",