v2.4.0 — OIDC login, OpenStreetMap search, account management

Features:
- Single Sign-On (OIDC) — login with Google, Apple, Authentik, Keycloak
- OpenStreetMap place search as free fallback when no Google API key
- Change password in user settings
- Delete own account (with last-admin protection)
- Last login column in admin user management
- SSO badge and provider info in user settings
- Google API key "Recommended" badge in admin panel

Improvements:
- API keys load correctly after page reload
- Validate auto-saves keys before testing
- Time format respects 12h/24h setting everywhere
- Dark mode fixes for popups and backup buttons
- Admin stats: removed photos, 4-column layout
- Profile picture upload button on avatar overlay
- TravelStats duplicate key fix
- Backup panel dark mode support

server/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "nomad-server",
-  "version": "2.0.0",
+  "version": "2.3.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "nomad-server",
-      "version": "2.0.0",
+      "version": "2.3.4",
       "dependencies": {
         "archiver": "^6.0.1",
         "bcryptjs": "^2.4.3",