perf: remove playwright/synpress from deps, fix Prisma binaryTargets for Vercel

- Remove @synthetixio/synpress (81MB), @playwright/test, playwright from devDeps
  These are E2E tools that Vercel downloads but never uses during build
- Add binaryTargets = ['native', 'rhel-openssl-3.0.x'] to Prisma schema
  Fixes PrismaClientInitializationError on Vercel's Linux serverless runtime (Next.js 16+)
- Add outputFileTracingIncludes for .prisma/client to prevent Next.js 16
  file tracing from excluding Prisma query engine binaries

Co-Authored-By: AdaL <adal@sylph.ai>

Author: chindris-mihai-alexandru

frontend/next.config.mjs

@@ -90,6 +90,11 @@ const nextConfig = {
     ]
   },
   // Tailwind CSS v4 uses postcss plugin
+  // Include Prisma query engine binaries in deployment bundle.
+  // Next.js 16 file tracing excludes them by default, causing runtime errors on Vercel.
+  outputFileTracingIncludes: {
+    '/**/*': ['./node_modules/.prisma/client/**/*'],
+  },
   experimental: {
     optimizePackageImports: ['lucide-react', 'framer-motion', 'recharts'],
   },

frontend/package.json

@@ -1,13 +1,10 @@
 {
   "devDependencies": {
-    "@playwright/test": "1.48.2",
-    "@synthetixio/synpress": "^4.1.2",
     "@tailwindcss/postcss": "^4.3.0",
     "@types/node": "^25.8.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "autoprefixer": "^10.5.0",
-    "playwright": "^1.48.2",
     "postcss": "^8.5.14",
     "prisma": "^5.22.0",
     "tailwindcss": "^4.3.0",

frontend/prisma/schema.prisma

@@ -2,7 +2,9 @@
 // learn more about it in the docs: https://pris.ly/d/prisma-schema
 
 generator client {
-  provider = "prisma-client-js"
+  provider      = "prisma-client-js"
+  // rhel-openssl-3.0.x is Vercel's serverless Linux runtime (Next.js 16+)
+  binaryTargets = ["native", "rhel-openssl-3.0.x"]
 }
 
 datasource db {