fix(web): add webpack SVG loader (TURBOPACK=0 prod builds)

turbopack.rules only applies to turbopack. When building with
TURBOPACK=0 (required for Payload CMS), webpack has no SVG rule.
Icons.UnitedKingdom returns an object → React #130. Adding a
webpack config rule for @svgr/webpack fixes both bundler paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/next.config.ts

@@ -102,6 +102,15 @@ const config: NextConfig = {
     },
   },
 
+  // Webpack SVG loader (used when TURBOPACK=0 for production builds)
+  webpack(config) {
+    config.module.rules.push({
+      test: /\.svg$/,
+      use: ["@svgr/webpack"],
+    });
+    return config;
+  },
+
   images: {
     remotePatterns: [
       {