Snapshots: Fix breadcrumb when not logged in (#110820)

public/app/core/selectors/navModel.test.ts

@@ -49,4 +49,26 @@ describe('getNavModel', () => {
     expect(navModel.main.children![2].active).toBe(undefined);
     expect(navModel.main.children![2].children![0].active).toBe(true);
   });
+
+  test('returns fallback nav model when provided for non-existent node', () => {
+    const fallbackNavModel = {
+      main: { id: 'fallback-main', text: 'Fallback Main', url: '/fallback' },
+      node: { id: 'fallback-node', text: 'Fallback Node', url: '/fallback/node' },
+    };
+
+    const navModel = getNavModel(navIndex, 'non-existent-id', fallbackNavModel);
+    expect(navModel).toBe(fallbackNavModel);
+    expect(navModel.main.id).toBe('fallback-main');
+    expect(navModel.node.id).toBe('fallback-node');
+  });
+
+  test('returns not found nav model when no fallback provided for non-existent node', () => {
+    const navModel = getNavModel(navIndex, 'non-existent-id');
+    expect(navModel.main.id).toBe('not-found');
+    expect(navModel.node.id).toBe('not-found');
+    expect(navModel.main.text).toBe('Page not found');
+    expect(navModel.main.subTitle).toBe('404 Error');
+    expect(navModel.main.icon).toBe('exclamation-triangle');
+    expect(navModel.main.url).toBe('not-found');
+  });
 });

public/app/features/dashboard-scene/scene/DashboardSceneRenderer.tsx

@@ -32,7 +32,15 @@ export function DashboardSceneRenderer({ model }: SceneComponentProps<DashboardS
   const scopesContext = useContext(ScopesContext);
   const navIndex = useSelector((state) => state.navIndex);
   const pageNav = model.getPageNav(location, navIndex);
-  const navModel = getNavModel(navIndex, `dashboards/${type === 'snapshot' ? 'snapshots' : 'browse'}`);
+  const navModel =
+    type === 'snapshot'
+      ? getNavModel(
+          navIndex,
+          'dashboards/snapshots',
+          // fallback navModel to prevent showing `Page not found` in snapshots
+          getNavModel(navIndex, 'home')
+        )
+      : getNavModel(navIndex, 'dashboards/browse');
   const isSettingsOpen = editview !== undefined;
   const soloPanelContext = useDefineSoloPanelContext(viewPanel);