feat: new ui with greyhaven design system

ui/nginx.conf

@@ -0,0 +1,27 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Without the trailing slash, redirect so relative asset paths resolve.
+    location = /v2 {
+        return 301 /v2/;
+    }
+
+    # React Router SPA under /v2 — fall back to index.html for client routes.
+    location /v2/ {
+        try_files $uri $uri/ /v2/index.html;
+    }
+
+    # Root convenience redirect to the SPA entry.
+    location = / {
+        return 302 /v2/;
+    }
+
+    # Long-cache hashed assets emitted by Vite.
+    location ~* /v2/assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}