Fix staff invitation acceptance & add delete/deactivate buttons

src/App.js

@@ -50,6 +50,7 @@ import Resources from './pages/Resources';
 import ContactUs from './pages/ContactUs';
 import TermsOfService from './pages/TermsOfService';
 import PrivacyPolicy from './pages/PrivacyPolicy';
+import AcceptInvitation from './pages/AcceptInvitation';
 
 const PrivateRoute = ({ children, adminOnly = false }) => {
   const { user, loading } = useAuth();
@@ -82,6 +83,7 @@ function App() {
           <Route path="/register" element={<Register />} />
           <Route path="/login" element={<Login />} />
           <Route path="/verify-email" element={<VerifyEmail />} />
+          <Route path="/accept-invitation" element={<AcceptInvitation />} />
           <Route path="/forgot-password" element={<ForgotPassword />} />
           <Route path="/reset-password" element={<ResetPassword />} />
           <Route path="/change-password-required" element={