feat: Add permission checks, fix search, fix document upload, fix linked documents always being loaded all at once instead of paged

lib/core/config/hive/hive_extensions.dart

@@ -0,0 +1,35 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:hive_flutter/adapters.dart';
+
+///
+/// Opens an encrypted box, calls [callback] with the now opened box, awaits
+/// [callback] to return and returns the calculated value. Closes the box after.
+///
+Future<R?> withEncryptedBox<T, R>(String name, FutureOr<R?> Function(Box<T> box) callback) async {
+  final key = await _getEncryptedBoxKey();
+  final box = await Hive.openBox<T>(
+    name,
+    encryptionCipher: HiveAesCipher(key),
+  );
+  final result = await callback(box);
+  await box.close();
+  return result;
+}
+
+Future<Uint8List> _getEncryptedBoxKey() async {
+  const secureStorage = FlutterSecureStorage();
+  if (!await secureStorage.containsKey(key: 'key')) {
+    final key = Hive.generateSecureKey();
+
+    await secureStorage.write(
+      key: 'key',
+      value: base64UrlEncode(key),
+    );
+  }
+  final key = (await secureStorage.read(key: 'key'))!;
+  return base64Decode(key);
+}