Upgrade frontend to Node 26, React 19, Vite 8, Apollo Client 4 and ESLint 10

frontend/tsconfig.json

@@ -1,27 +1,7 @@
 {
-  "compilerOptions": {
-    "target": "ES2021",
-    "useDefineForClassFields": true,
-    "lib": [
-      "DOM",
-      "DOM.Iterable",
-      "ES2021"
-    ],
-    "allowJs": false,
-    "skipLibCheck": true,
-    "esModuleInterop": false,
-    "allowSyntheticDefaultImports": true,
-    "strict": true,
-    "forceConsistentCasingInFileNames": true,
-    "module": "ES2020",
-    "moduleResolution": "Node",
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "noEmit": true,
-    "jsx": "react-jsx",
-  },
-  "include": [
-    "./src",
-    "node_modules/vite/types/importMeta.d.ts"
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
   ]
-}
+}