feat: add per-namespace detail pages with dynamic sidebar sub-items

Add drill-down namespace views under the Polaris sidebar entry. Each
namespace gets a sidebar sub-item registered dynamically from audit data,
linking to /polaris/:namespace with a score summary and per-resource table.

Introduces a shared PolarisDataContext so the sidebar registrar and view
components share a single data fetch. Also updates the Artifact Hub
repository ID.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/index.tsx

@@ -4,6 +4,9 @@ import {
   registerSidebarEntry,
 } from '@kinvolk/headlamp-plugin/lib';
 import React from 'react';
+import { PolarisDataProvider } from './api/PolarisDataContext';
+import DynamicSidebarRegistrar from './components/DynamicSidebarRegistrar';
+import NamespaceDetailView from './components/NamespaceDetailView';
 import PolarisSettings from './components/PolarisSettings';
 import PolarisView from './components/PolarisView';
 
@@ -20,7 +23,25 @@ registerRoute({
   sidebar: 'polaris',
   name: 'polaris',
   exact: true,
-  component: () => <PolarisView />,
+  component: () => (
+    <PolarisDataProvider>
+      <DynamicSidebarRegistrar />
+      <PolarisView />
+    </PolarisDataProvider>
+  ),
+});
+
+registerRoute({
+  path: '/polaris/:namespace',
+  sidebar: 'polaris',
+  name: 'polaris-namespace',
+  exact: true,
+  component: () => (
+    <PolarisDataProvider>
+      <DynamicSidebarRegistrar />
+      <NamespaceDetailView />
+    </PolarisDataProvider>
+  ),
 });
 
 registerPluginSettings('polaris-headlamp-plugin', PolarisSettings, true);