Add LOTL Timeline page for live tier progression visualization.

Operators get a dedicated Onion view with 14-tier stepper, fleet progress chips, and AI decision overlay when fleet AI control is enabled.

server/web/src/App.tsx

@@ -21,6 +21,7 @@ const BuildManagerPage = lazy(() => import('./pages/BuildManagerPage'));
 const SettingsPage = lazy(() => import('./pages/SettingsPage'));
 const PathTracerPage = lazy(() => import('./pages/PathTracerPage'));
 const EmberwakePage = lazy(() => import('./pages/EmberwakePage'));
+const LotlTimelinePage = lazy(() => import('./pages/LotlTimelinePage'));
 
 export function PageFallback() {
   return (
@@ -59,6 +60,8 @@ function App() {
             <Route path="/spread" element={<Navigate to="/emberwake" replace />} />
             <Route path="/settings" element={<SettingsPage />} />
             <Route path="/pathtracer" element={<PathTracerPage />} />
+            <Route path="/lotl-timeline" element={<LotlTimelinePage />} />
+            <Route path="/onion" element={<Navigate to="/lotl-timeline" replace />} />
           </Routes>
         </Suspense>
       </Layout>