Bump desktop app to 0.1.5 (release with Lua auto-install, smoothing, airspace + Linux patchelf fix)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

desktop/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "X-Plane Cockpit",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "identifier": "ch.kgva.xplanecockpit",
   "build": {
     "frontendDist": "../ui"