feat: add configurable Polaris dashboard URL setting

- Add getDashboardUrl() and setDashboardUrl() functions to polaris.ts
- Update PolarisSettings with dashboard URL input field
- Replace hardcoded POLARIS_DASHBOARD_PROXY with configurable getPolarisProxyUrl()
- Increase namespace detail panel width to 800px
- Remove unused 'Skipped' field from overview dashboard
- Version bump to 0.2.2

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "headlamp-polaris-plugin",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Headlamp plugin for Fairwinds Polaris audit results",
   "scripts": {
     "start": "headlamp-plugin start",