Update dependencies and environment for web app

Upgraded '@makerkit/data-loader-supabase-nextjs' to version 1.1.0 and replaced 'autoprefixer' with a newer version. Added new scripts to 'packages.json' and '.env.test' file for test environment. The changes also include removal of unnecessary 'eslint' dependencies and modifications for 'postcss' related dependencies.

apps/web/package.json

@@ -7,11 +7,13 @@
   "scripts": {
     "analyze": "ANALYZE=true pnpm run build",
     "build": "pnpm with-env next build",
+    "build:test": "NODE_ENV=test next build",
     "clean": "git clean -xdf .next .turbo node_modules",
     "dev": "pnpm with-env next dev --turbo",
     "next:lint": "next lint",
     "format": "prettier --check \"**/*.{js,cjs,mjs,ts,tsx,md,json}\"",
     "start": "pnpm with-env next start",
+    "start:test": "NODE_ENV=test pnpm with-env:test next start",
     "typecheck": "tsc --noEmit",
     "with-env": "dotenv -e ./.env.local --",
     "with-env:test": "dotenv -e ./.env.test --",
@@ -46,7 +48,7 @@
     "@kit/team-accounts": "workspace:^",
     "@kit/ui": "workspace:^",
     "@makerkit/data-loader-supabase-core": "^0.0.7",
-    "@makerkit/data-loader-supabase-nextjs": "^1.0.0",
+    "@makerkit/data-loader-supabase-nextjs": "beta",
     "@marsidev/react-turnstile": "^0.5.4",
     "@radix-ui/react-icons": "^1.3.0",
     "@supabase/supabase-js": "^2.42.3",