feat(onboarding): add sso-gate step

src/features/onboarding/steps/step-sso-gate.tsx

@@ -0,0 +1,41 @@
+"use client";
+
+import { useOnboarding } from "@onboardjs/react";
+import { Button } from "@/components/ui/button";
+import { mockSsoConfig } from "@/features/onboarding/onboarding.mock";
+
+export const StepSsoGate = () => {
+    const { next, updateContext, state } = useOnboarding();
+
+    const chooseProvider = async (providerId: string) => {
+        await updateContext({ flowData: { ...state?.context.flowData, sso: { providerId } } });
+        await next();
+    };
+
+    const continueWithEmail = async () => {
+        await next();
+    };
+
+    return (
+        <div className="flex flex-col gap-4">
+            <div>
+                <h1 className="text-2xl font-semibold">Welcome to Portabase</h1>
+                <p className="text-sm text-muted-foreground mt-1">
+                    Sign in with your organisation provider, or continue with email.
+                </p>
+            </div>
+            <div className="flex flex-col gap-2">
+                {mockSsoConfig.providers.map((provider) => (
+                    <Button key={provider.id} variant="outline" type="button" onClick={() => chooseProvider(provider.id)}>
+                        Continue with {provider.label}
+                    </Button>
+                ))}
+            </div>
+            {!mockSsoConfig.forced && (
+                <Button type="button" onClick={continueWithEmail}>
+                    Continue with email
+                </Button>
+            )}
+        </div>
+    );
+};