Enhance backtunnel-share with improved desktop integration, port collision checks, and pre-flight validations

scripts/uninstall.sh

@@ -39,4 +39,12 @@ sudo rm -f /usr/share/kservices5/ServiceMenus/backtunnel_access.desktop || true
 echo "🧹 Removing desktop launcher ..."
 sudo rm -f /usr/share/applications/backtunnel.desktop || true
 
+# Refresh desktop DB and KDE service cache (best-effort)
+command -v update-desktop-database >/dev/null 2>&1 && sudo update-desktop-database -q || true
+if command -v kbuildsycoca6 >/dev/null 2>&1; then
+  kbuildsycoca6 --noincremental >/dev/null 2>&1 || true
+elif command -v kbuildsycoca5 >/dev/null 2>&1; then
+  kbuildsycoca5 --noincremental >/dev/null 2>&1 || true
+fi
+
 echo "✅ Uninstall complete."