feat: put the account's Full VPN setting back when the VPN goes off; release 0.1.3

The node the plugin sets is account-wide, so the PC's Mudfish would also
start in Full VPN. Remember the account's own value before changing it and
restore it on every teardown (off, connect failure, resume, unload,
uninstall); retry in the background if the restore fails.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mudfish-decky",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "Toggle Mudfish Cloud VPN Full VPN mode from Steam Deck Gaming Mode",
   "type": "module",
   "scripts": {