diff --git a/Makefile b/Makefile
index 66e7dc4..c9f1a99 100644
--- a/Makefile
+++ b/Makefile
@@ -96,7 +96,15 @@ demo-smoke:
 	[ -z "$$PORT" ] && PORT=$$(grep "^PORT=" demo/symfony8/.env.example 2>/dev/null | cut -d= -f2 | tr -d '\r'); \
 	[ -z "$$PORT" ] && PORT=8010; \
 	echo "Smoke GET http://localhost:$$PORT/en/login"; \
-	code=$$(curl -fsS -o /dev/null -w "%{http_code}" "http://localhost:$$PORT/en/login" || true); \
+	code=000; \
+	i=0; \
+	while [ $$i -lt 30 ]; do \
+		code=$$(curl -s -o /dev/null -w "%{http_code}" "http://127.0.0.1:$$PORT/en/login" || true); \
+		[ -z "$$code" ] && code=000; \
+		if [ "$$code" = "200" ]; then break; fi; \
+		i=$$((i+1)); \
+		sleep 2; \
+	done; \
 	if [ "$$code" != "200" ]; then echo "demo-smoke failed: HTTP $$code"; exit 1; fi; \
 	echo "demo-smoke OK (HTTP 200)"
 
diff --git a/demo/symfony8/Dockerfile b/demo/symfony8/Dockerfile
index 7cb1f30..493151a 100644
--- a/demo/symfony8/Dockerfile
+++ b/demo/symfony8/Dockerfile
@@ -7,7 +7,8 @@ RUN install-php-extensions intl pdo_mysql zip
 
 COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
 
-RUN git config --global --add safe.directory /app
+RUN git config --global --add safe.directory /app && \
+    git config --global --add safe.directory /var/auth-kit-bundle
 
 WORKDIR /app
 
diff --git a/demo/symfony8/docker/entrypoint.sh b/demo/symfony8/docker/entrypoint.sh
index e5c30df..22b0591 100644
--- a/demo/symfony8/docker/entrypoint.sh
+++ b/demo/symfony8/docker/entrypoint.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 set -e
 
+git config --global --add safe.directory /app 2>/dev/null || true
+git config --global --add safe.directory /var/auth-kit-bundle 2>/dev/null || true
+
 # Wait until Composer has installed the app (make up runs install after start).
 # Without this, FrankenPHP worker mode exits immediately on a clean checkout (CI).
 i=0
diff --git a/src/Twig/AuthKitUiExtension.php b/src/Twig/AuthKitUiExtension.php
index 99e7efb..b85b804 100644
--- a/src/Twig/AuthKitUiExtension.php
+++ b/src/Twig/AuthKitUiExtension.php
@@ -55,12 +55,21 @@ public function getGlobals(): array
 
     public function getFunctions(): array
     {
-        return [
+        $functions = [
             new TwigFunction('nowo_auth_kit_outbound_mail_ready', $this->isOutboundMailReady(...)),
             new TwigFunction('nowo_auth_kit_slide_to_confirm_assets', $this->shouldLoadSlideToConfirmAssets(...)),
             new TwigFunction('nowo_auth_kit_device_intelligence_assets', $this->shouldLoadDeviceIntelligenceAssets(...)),
             new TwigFunction('nowo_auth_kit_otp_input_assets', $this->shouldLoadOtpInputAssets(...)),
         ];
+
+        // Optional bundle Twig functions are referenced in _slide_to_confirm_assets.html.twig;
+        // register no-op stubs so templates compile when the package is not installed.
+        if (!class_exists('Nowo\\SlideToConfirmBundle\\Twig\\NowoSlideToConfirmTwigExtension')) {
+            $functions[] = new TwigFunction('nowo_slide_to_confirm_asset_path', static fn (): string => ''); // @codeCoverageIgnore
+            $functions[] = new TwigFunction('nowo_slide_to_confirm_asset_package', static fn (): string => ''); // @codeCoverageIgnore
+        }
+
+        return $functions;
     }
 
     public function isOutboundMailReady(): bool
diff --git a/tests/Unit/Twig/AuthKitUiExtensionTest.php b/tests/Unit/Twig/AuthKitUiExtensionTest.php
index 1b3c6e4..9cc9f5e 100644
--- a/tests/Unit/Twig/AuthKitUiExtensionTest.php
+++ b/tests/Unit/Twig/AuthKitUiExtensionTest.php
@@ -62,12 +62,35 @@ public function isReady(): bool
         self::assertFalse($extension->isOutboundMailReady());
     }
 
+    public function testRegistersSlideToConfirmStubTwigFunctionsWhenBundleAbsent(): void
+    {
+        if (class_exists('Nowo\\SlideToConfirmBundle\\Twig\\NowoSlideToConfirmTwigExtension')) {
+            self::markTestSkipped('SlideToConfirm bundle is installed in this environment.');
+        }
+
+        $extension = new AuthKitUiExtension([], [], new AlwaysOutboundMailReadyChecker());
+        $byName    = [];
+        foreach ($extension->getFunctions() as $function) {
+            $byName[$function->getName()] = $function->getCallable();
+        }
+
+        self::assertArrayHasKey('nowo_slide_to_confirm_asset_path', $byName);
+        self::assertArrayHasKey('nowo_slide_to_confirm_asset_package', $byName);
+
+        /** @var callable(): string $pathCallable */
+        $pathCallable = $byName['nowo_slide_to_confirm_asset_path'];
+        /** @var callable(): string $packageCallable */
+        $packageCallable = $byName['nowo_slide_to_confirm_asset_package'];
+        self::assertSame('', $pathCallable());
+        self::assertSame('', $packageCallable());
+    }
+
     public function testRegistersOutboundMailReadyTwigFunction(): void
     {
         $extension = new AuthKitUiExtension([], [], new AlwaysOutboundMailReadyChecker());
         $functions = $extension->getFunctions();
 
-        self::assertCount(4, $functions);
+        self::assertCount(class_exists('Nowo\\SlideToConfirmBundle\\Twig\\NowoSlideToConfirmTwigExtension') ? 4 : 6, $functions);
         self::assertSame('nowo_auth_kit_outbound_mail_ready', $functions[0]->getName());
         self::assertSame('nowo_auth_kit_slide_to_confirm_assets', $functions[1]->getName());
         self::assertSame('nowo_auth_kit_device_intelligence_assets', $functions[2]->getName());