fix documents path not found on linux

devenv.nix

@@ -38,6 +38,9 @@
   packages = with pkgs; [
     # Needed by flutter_secure_storage
     libsecret.dev
+
+    # Needed by path_provider on linux
+    xdg-user-dirs
   ];
 
   processes.web-server = {

lib/main.dart

@@ -39,7 +39,7 @@ Future<void> _initializePlugins() async {
   // PDF rendering (especially needed for web)
   pdfrxFlutterInitialize();
 
-  // Local storage (not supported on web)
+  // Local storage (not supported or necessary on web)
   if (!kIsWeb) {
     final dir = await getApplicationDocumentsDirectory();
     Hive.init(dir.path);