Remove react-router-dom, render Extensions directly

The Routes component used a catch-all route (path="*") that always
rendered <Extensions />. No actual routing was happening. Render the
component directly in App.tsx and remove the Routes wrapper, its
directory, and the react-router-dom dependency.

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

Author: ryancbahan

packages/ui-extensions-dev-console/package.json

@@ -18,7 +18,6 @@
     "qrcode.react": "^4.2.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
-    "react-router-dom": "^6.14.2",
     "react-toastify": "^9.1.3",
     "react-transition-group": "^4.4.5"
   },

packages/ui-extensions-dev-console/src/App.tsx

@@ -1,5 +1,5 @@
 import {Layout} from '@/foundation/Layout'
-import {Routes} from '@/foundation/Routes'
+import {Extensions} from '@/sections/Extensions'
 import {Toast} from '@/foundation/Toast'
 import {Theme} from '@/foundation/Theme'
 import {ModalContainer} from '@/foundation/ModalContainer'
@@ -29,7 +29,7 @@ function App() {
     <ExtensionServerProvider options={extensionServerOptions}>
       <Theme>
         <Layout>
-          <Routes />
+          <Extensions />
           <Toast />
           <ModalContainer />
         </Layout>