Fix preview mode stale content bug when switching notes (v0.1.1)

- Fixed race condition where image processing ran before localContent updated
- Added synchronization guard to prevent processing stale content
- Added comprehensive logging for debugging note switches
- Bumped version to 0.1.1

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Nextcloud Notes",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "identifier": "com.davidrelich.nextcloud-notes",
   "build": {
     "beforeDevCommand": "npm run dev",