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

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "headlamp-polaris-plugin",
-  "version": "0.1.3",
+  "version": "0.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "headlamp-polaris-plugin",
-      "version": "0.1.3",
+      "version": "0.2.0",
       "devDependencies": {
         "@kinvolk/headlamp-plugin": "^0.13.0",
         "@playwright/test": "^1.58.2"