refactor: use open_filex instead of open_file with xdg-open workaround

- Replace open_file + manual xdg-open with open_filex (maintained fork)
- open_filex has better Linux support built-in
- Removes platform-specific code, cleaner implementation

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

lib/ui/screens/compose_screen.dart

@@ -6,7 +6,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:mime/mime.dart';
-import 'package:open_file/open_file.dart';
+import 'package:open_filex/open_filex.dart';
 
 import '../../core/models/account.dart';
 import '../../core/models/email.dart';
@@ -187,20 +187,7 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
     setState(() => _opening = true);
     try {
       final path = _attachments[index].path;
-
-      // On Linux, OpenFile.open may fail with "file type not supported".
-      // Use xdg-open directly for better compatibility.
-      if (Platform.isLinux) {
-        final result = await Process.run('xdg-open', [path]);
-        if (result.exitCode != 0 && mounted) {
-          throw Exception(
-            'xdg-open failed: ${result.stderr}\n'
-            'File path: $path',
-          );
-        }
-      } else {
-        await OpenFile.open(path);
-      }
+      await OpenFilex.open(path);
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(

lib/ui/screens/email_detail_screen.dart

@@ -1,11 +1,10 @@
 import 'dart:async';
-import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
-import 'package:open_file/open_file.dart';
+import 'package:open_filex/open_filex.dart';
 
 import '../../core/models/email.dart';
 import '../../core/utils/format_utils.dart';
@@ -162,20 +161,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
       final path = await ref
           .read(emailRepositoryProvider)
           .downloadAttachment(widget.emailId, att);
-
-      // On Linux, OpenFile.open may fail with "file type not supported".
-      // Use xdg-open directly for better compatibility.
-      if (Platform.isLinux) {
-        final result = await Process.run('xdg-open', [path]);
-        if (result.exitCode != 0 && mounted) {
-          throw Exception(
-            'xdg-open failed: ${result.stderr}\n'
-            'File saved to: $path',
-          );
-        }
-      } else {
-        await OpenFile.open(path);
-      }
+      await OpenFilex.open(path);
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(

pubspec.yaml

@@ -34,7 +34,7 @@ dependencies:
 
   # File picking (compose attachments) and opening downloaded attachments
   file_picker: ^8.0.0
-  open_file: ^3.3.2
+  open_filex: ^4.6.0
   mime: ^2.0.0
 
 dev_dependencies: