feat: add full-page chat route and sidebar menu ordering

frontend/src/App.tsx

@@ -39,6 +39,7 @@ import AusruestungsanfrageNeu from './pages/AusruestungsanfrageNeu';
 import Issues from './pages/Issues';
 import IssueDetail from './pages/IssueDetail';
 import IssueNeu from './pages/IssueNeu';
+import Chat from './pages/Chat';
 import AdminDashboard from './pages/AdminDashboard';
 import AdminSettings from './pages/AdminSettings';
 import NotFound from './pages/NotFound';
@@ -77,6 +78,14 @@ function App() {
                 </ProtectedRoute>
               }
             />
+            <Route
+              path="/chat"
+              element={
+                <ProtectedRoute>
+                  <Chat />
+                </ProtectedRoute>
+              }
+            />
             <Route
               path="/einsaetze"
               element={
@@ -261,14 +270,6 @@ function App() {
                 </ProtectedRoute>
               }
             />
-            <Route
-              path="/bestellungen/lieferanten/neu"
-              element={
-                <ProtectedRoute>
-                  <LieferantDetail />
-                </ProtectedRoute>
-              }
-            />
             <Route
               path="/bestellungen/lieferanten/:id"
               element={