Strip template artifacts and fix lint errors

Remove npm lockfile, unused create-next-app SVGs, project-specific
next.config workarounds, and the unused @remixicon/react and date-fns deps.

Replace three set-state-in-effect patterns with useSyncExternalStore in
use-mobile, DialogPortal, and Carousel; the carousel change also fixes a
leaked reInit listener. yarn lint and yarn build are clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K8PmydbW6A1S2Tw3SFc3Cg

next.config.js

@@ -1,34 +1,6 @@
 module.exports = {
   reactStrictMode: true,
-  typescript: {
-    ignoreBuildErrors: true,
-  },
   images: {
     unoptimized: true,
-    remotePatterns: [
-      {
-        protocol: "https",
-        hostname: "images.unsplash.com",
-      },
-      {
-        protocol: "https",
-        hostname: "cdn.shopify.com",
-      },
-      {
-        protocol: "https",
-        hostname: "**.frontend.co",
-      },
-    ],
-  },
-  experimental: {
-    reactDebugChannel: false,
-  },
-  webpack: (config, { isServer }) => {
-    config.cache = { type: "memory" };
-    if (isServer) {
-      config.optimization = config.optimization || {};
-      config.optimization.splitChunks = false;
-    }
-    return config;
   },
 };