Task file attachments

lib/providers/tasks_provider.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'dart:io';
+import 'dart:typed_data';
 import 'package:flutter/foundation.dart';
 import 'dart:convert';
 
@@ -741,6 +742,64 @@ class TasksController {
     }
   }
 
+  Future<void> uploadTaskAttachment({
+    required String taskId,
+    required String fileName,
+    required Uint8List bytes,
+  }) async {
+    final path = '$taskId/$fileName';
+    try {
+      debugPrint('uploadTaskAttachment uploading to path: $path');
+
+      final dynamic res;
+      if (kIsWeb) {
+        // on web, upload binary data
+        res = await _client.storage
+            .from('task_attachments')
+            .uploadBinary(path, bytes);
+      } else {
+        // write bytes to a simple temp file (no nested folders)
+        final tmpDir = Directory.systemTemp;
+        final localFile = File(
+          '${tmpDir.path}/${DateTime.now().millisecondsSinceEpoch}_$fileName',
+        );
+        try {
+          await localFile.create();
+          await localFile.writeAsBytes(bytes);
+        } catch (e) {
+          debugPrint('uploadTaskAttachment failed writing temp file: $e');
+          rethrow;
+        }
+
+        res = await _client.storage
+            .from('task_attachments')
+            .upload(path, localFile);
+
+        try {
+          await localFile.delete();
+        } catch (_) {}
+      }
+
+      debugPrint(
+        'uploadTaskAttachment response type=${res.runtimeType} value=$res',
+      );
+
+      // Check for errors
+      if (res is String) {
+        // treat as success
+      } else if (res is Map && res['error'] != null) {
+        debugPrint('uploadTaskAttachment upload error: ${res['error']}');
+        throw Exception('Upload error: ${res['error']}');
+      } else if (res != null && res.error != null) {
+        debugPrint('uploadTaskAttachment upload error: ${res.error}');
+        throw Exception('Upload error: ${res.error}');
+      }
+    } catch (e) {
+      debugPrint('uploadTaskAttachment failed: $e');
+      rethrow;
+    }
+  }
+
   Future<void> _notifyCreated({
     required String taskId,
     required String? actorId,