fix: store Hive data in the app support directory, not ~/Documents

lib/main.dart

@@ -1,6 +1,7 @@
 import "package:flutter/material.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:hive_flutter/hive_flutter.dart";
+import "package:path_provider/path_provider.dart";
 
 import "package:smol_mail/data/providers/providers.dart";
 import "package:smol_mail/smol/config.dart";
@@ -9,7 +10,12 @@ import "package:smol_mail/presentation/app_widget.dart";
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  await Hive.initFlutter();
+  // Hive.initFlutter() defaults to getApplicationDocumentsDirectory(), which
+  // on Linux resolves to the user's actual ~/Documents folder (XDG_DOCUMENTS_DIR)
+  // rather than app-private storage — getApplicationSupportDirectory() is the
+  // one that's actually sandboxed per-app on every platform.
+  final dataDir = await getApplicationSupportDirectory();
+  Hive.init(dataDir.path);
   final store = await SmolStore.open();
   applyPresetServer(store);
 

pubspec.lock

@@ -625,7 +625,7 @@ packages:
     source: hosted
     version: "1.9.1"
   path_provider:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path_provider
       sha256: a7f4874f987173da295a61c181b8ee71dab59b332a486b391babf26a1b884825

pubspec.yaml

@@ -18,6 +18,7 @@ dependencies:
   flutter_riverpod: ^3.3.2
   intl: ^0.20.3
   share_plus: ^13.3.0
+  path_provider: ^2.1.6
   file_picker: ^13.1.0
 
 dev_dependencies: