Start integrating the onboarding flow with backend 6

frontend/src/stores/useTenantInitializer.ts

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+import { useEffect } from 'react';
+import { useIsAuthenticated } from './auth.store';
+import { useTenantActions, useAvailableTenants } from './tenant.store';
+
+/**
+ * Hook to automatically initialize tenant data when user is authenticated
+ * This should be used at the app level to ensure tenant data is loaded
+ */
+export const useTenantInitializer = () => {
+  const isAuthenticated = useIsAuthenticated();
+  const availableTenants = useAvailableTenants();
+  const { loadUserTenants } = useTenantActions();
+
+  useEffect(() => {
+    if (isAuthenticated && !availableTenants) {
+      // Load user's available tenants when authenticated and not already loaded
+      loadUserTenants();
+    }
+  }, [isAuthenticated, availableTenants, loadUserTenants]);
+
+  // Also load tenants when user becomes authenticated (e.g., after login)
+  useEffect(() => {
+    if (isAuthenticated && availableTenants === null) {
+      loadUserTenants();
+    }
+  }, [isAuthenticated, availableTenants, loadUserTenants]);
+};