Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

server/web/src/pages/DashboardPage.test.tsx

@@ -7,6 +7,7 @@ import userEvent from '@testing-library/user-event';
 import { MemoryRouter } from 'react-router-dom';
 import DashboardPage, { formatShareTime } from './DashboardPage';
 import { mockAgent, mockShare } from '../test/fixtures';
+import { routerFuture } from '../routerFuture';
 import { useWebSocket } from '../hooks/useWebSocket';
 import { api } from '../api/client';
 
@@ -41,7 +42,7 @@ function wsValue(overrides: Partial<ReturnType<typeof useWebSocket>> = {}) {
 
 function renderDashboard() {
   return render(
-    <MemoryRouter>
+    <MemoryRouter future={routerFuture}>
       <DashboardPage />
     </MemoryRouter>
   );