Fix local dev API wiring and theme default

package.json

@@ -4,7 +4,8 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "concurrently \"npm:dev:client\" \"npm:dev:server\"",
+    "dev:client": "vite",
     "dev:server": "tsx server/index.ts",
     "build:client": "vite build",
     "build:server": "tsc -p tsconfig.server.json --noEmit && esbuild server/index.ts --bundle --platform=node --format=cjs --outfile=server-dist/index.cjs",
@@ -22,6 +23,7 @@
     "@types/react-dom": "^19.2.3",
     "@types/supertest": "^7.2.0",
     "@vitejs/plugin-react": "^6.0.1",
+    "concurrently": "^9.2.1",
     "esbuild": "^0.27.4",
     "jsdom": "^29.0.1",
     "supertest": "^7.2.2",