feat(ApplicationDetail): implement ArgoCD Application Detail view

- New component: src/components/ApplicationDetail.tsx
  - Route: /argocd/applications/:name
  - Header: app name, health/sync badges, project, namespace, target revision, repo URL
  - Resource Tree: table of Application.status.resources[] with kind, name, namespace, health, sync
  - Sync History: table of Application.status.history[] (last 10) with revision, deployedAt, initiatedBy
  - Events: K8s events via fieldSelector=involvedObject.name={appName}
- Updated src/components/ApplicationsList.tsx: App Name column links to detail view
- Updated src/index.tsx: added ApplicationDetail route
- Unit tests: 11 tests covering pure functions and component smoke tests

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/index.tsx

@@ -7,6 +7,7 @@ import {
   StatusLabel,
 } from "@kinvolk/headlamp-plugin/lib/CommonComponents";
 import React from "react";
+import ApplicationDetail from "./components/ApplicationDetail";
 import ApplicationsList from "./components/ApplicationsList";
 
 // --- Error boundary for plugin components ---
@@ -68,3 +69,14 @@ registerRoute({
     </ArgoCDErrorBoundary>
   ),
 });
+
+registerRoute({
+  path: "/argocd/applications/:name",
+  sidebar: "argocd-overview",
+  name: "argocd-application-detail",
+  component: () => (
+    <ArgoCDErrorBoundary>
+      <ApplicationDetail />
+    </ArgoCDErrorBoundary>
+  ),
+});