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

frontend/vite.config.ts

@@ -0,0 +1,22 @@
+import { defineConfig } from "vite";
+import react, { reactCompilerPreset } from "@vitejs/plugin-react";
+import babel from "@rolldown/plugin-babel";
+import svgr from "vite-plugin-svgr";
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react(), babel({ presets: [reactCompilerPreset()] }), svgr()],
+  define: {
+    __DEV__: process.env.NODE_ENV !== "production",
+  },
+  envDir: "..",
+  server: {
+    host: "127.0.0.1",
+    proxy: Object.fromEntries(
+      ["/admin", "/accounts", "/static", "/media", "/graphql"].map(
+        (path) => [path, process.env.VITE_DEV_API_PROXY || "http://127.0.0.1:3000"],
+      ),
+    ),
+  },
+  build: { outDir: "../static", emptyOutDir: false },
+});