fix(ui): restore brand across anonymous and error pages

Assisted-by: Codex:GPT-5

tests/integration/view_test.go

@@ -25,6 +25,7 @@ func TestView(t *testing.T) {
 	t.Run("SecurityHeadersDefaults", testSecurityHeadersDefaults)
 	t.Run("SiteManifest", testSiteManifest)
 	t.Run("CurrentURL", testViewPageCurrentURL)
+	t.Run("NavbarBrandVisibility", testNavbarBrandVisibility)
 }
 
 func testRenderFileSVGIsInImgTag(t *testing.T) {
@@ -129,3 +130,24 @@ func testViewPageCurrentURL(t *testing.T) {
 	MakeRequest(t, NewRequest(t, "GET", "/any-page?k=v"), http.StatusNotFound)
 	assert.Equal(t, "/subpath/any-page?k=v", currentURL)
 }
+
+func testNavbarBrandVisibility(t *testing.T) {
+	assertBrand := func(t *testing.T, session *TestSession, uri string, status int, visible bool) {
+		t.Helper()
+		resp := session.MakeRequest(t, NewRequest(t, "GET", uri), status)
+		doc := NewHTMLParser(t, resp.Body)
+		brand := strings.Join(strings.Fields(doc.doc.Find("#navbar-logo .navbar-brand-copy").Text()), " ")
+		if visible {
+			assert.Equal(t, "荣刻科技 RONCARVE TECHNOLOGY", brand)
+		} else {
+			assert.Empty(t, brand)
+		}
+	}
+
+	assertBrand(t, emptyTestSession(t), "/user/login", http.StatusOK, true)
+	assertBrand(t, emptyTestSession(t), "/brand-page-does-not-exist", http.StatusNotFound, true)
+
+	session := loginUser(t, "user2")
+	assertBrand(t, session, "/user2", http.StatusOK, false)
+	assertBrand(t, session, "/brand-page-does-not-exist", http.StatusNotFound, true)
+}