fix(web): restore turbopack SVG loader (fixes React #130)

The turbopack.rules config for @svgr/webpack was removed during
the Payload integration attempts. Without it, SVG imports return
raw module objects instead of React components. This crashes
LocaleCustomizer → Icons.UnitedKingdom → object → React #130.

Next.js 16.2.2 supports turbopack in production builds, so this
config is safe now.

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

apps/web/next.config.ts

@@ -87,6 +87,15 @@ const config: NextConfig = {
     "@payloadcms/richtext-lexical",
     "sharp",
   ],
+  turbopack: {
+    rules: {
+      "*.svg": {
+        loaders: ["@svgr/webpack"],
+        as: "*.js",
+      },
+    },
+  },
+
   images: {
     remotePatterns: [
       {