fix signin signout and apply the new style

apps/dashboard/next.config.js

@@ -23,14 +23,14 @@ const storagePatterns = [
   .filter(Boolean)
   .filter((p, i, arr) => arr.findIndex((q) => q.hostname === p.hostname && q.port === p.port) === i)
 
-// When the dashboard is accessed via the marketplace proxy (localhost:3000/dashboard),
-// the browser resolves _next/static chunk URLs relative to localhost:3000 — but those
-// chunks only exist on the dashboard's own server (localhost:3001). DASHBOARD_ASSET_PREFIX
-// makes Next.js embed absolute chunk URLs so the browser fetches them from the right port.
-// Set in .env.docker.dev; unset for local/production (where no cross-port proxy is used).
+// In Docker dev the dashboard app runs on port 3001 while the marketplace proxy
+// is served from port 3000. When DASHBOARD_ASSET_PREFIX is set, Next should emit
+// absolute chunk URLs so /dashboard pages load their own JS/CSS from port 3001.
+const assetPrefix = process.env.DASHBOARD_ASSET_PREFIX || undefined
+
 const nextConfig = {
   basePath: '/dashboard',
-  ...(process.env.DASHBOARD_ASSET_PREFIX ? { assetPrefix: process.env.DASHBOARD_ASSET_PREFIX } : {}),
+  ...(assetPrefix ? { assetPrefix } : {}),
   images: {
     remotePatterns: [
       {