release: v0.4.1 — code quality fixes and doc updates

Remove unsafe `as any` casts, fix MetricsPage fetch cancellation safety,
delete dead AppBarGpuBadge component, fix typo in data context, move
extractJsonData to module scope, resolve ESLint/Prettier indent conflict,
fix artifacthub-pkg.yml version mismatch and inaccurate description.

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

.eslintrc.js

@@ -1,3 +1,8 @@
 module.exports = {
   extends: ['@headlamp-k8s/eslint-config'],
+  rules: {
+    // Prettier handles indentation; the shared config's indent rule
+    // conflicts with Prettier's JSX ternary formatting.
+    indent: 'off',
+  },
 };