feat: improve UX with drawer detail view and proper settings placement

Major UX improvements:
- Changed detail view from full page to drawer (slides from right)
- Moved plugin settings from sidebar to Settings → Plugins (proper pattern)
- Fixed React error #310 by adding defensive String() wrappers
- Fixed syncMessage getter to always return string
- Added safety checks for encryptedData access
- Added error handling for useGet failures

The drawer approach keeps the list visible while viewing details,
matching Headlamp's design patterns. Settings are now properly
located in the global Settings → Plugins section instead of
cluttering the plugin's sidebar navigation.

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>

headlamp-sealed-secrets/package.json

@@ -1,6 +1,6 @@
 {
   "name": "headlamp-sealed-secrets",
-  "version": "0.2.10",
+  "version": "0.2.11",
   "description": "Headlamp plugin for Bitnami Sealed Secrets - manage encrypted Kubernetes secrets",
   "files": [
     "dist",