feat(flutter): add attachment support and macOS P2P permissions

Add basic attachment functionality to Flutter quickstart app and
configure macOS for P2P sync.

Attachment implementation:
- Add optional attachment field to Task model
- Add attachment note input field in task dialog
- Implement attachment creation with store.newAttachment()
- Implement attachment fetching with store.fetchAttachment()
- Display attachment indicator and view button in task list

macOS P2P permissions:
- Add NSBluetoothAlwaysUsageDescription for BLE sync
- Add NSLocalNetworkUsageDescription for WiFi P2P
- Add NSBonjourServices for local network discovery
- Add com.apple.security.network.client entitlement for cloud sync
- Add com.apple.security.network.server entitlement for P2P sync

iOS simulator support:
- Add iphonesimulator to SUPPORTED_PLATFORMS for Release/Profile builds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Teodor Ciuraru

flutter_app/ios/Runner.xcodeproj/project.pbxproj

@@ -478,7 +478,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
-				SUPPORTED_PLATFORMS = iphoneos;
+				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 			};
@@ -665,7 +665,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
-				SUPPORTED_PLATFORMS = iphoneos;
+				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				TARGETED_DEVICE_FAMILY = "1,2";

flutter_app/lib/dialog.dart

@@ -18,6 +18,7 @@ class _Dialog extends StatefulWidget {
 
 class _DialogState extends State<_Dialog> {
   late final _name = TextEditingController(text: widget.taskToEdit?.title);
+  late final _attachmentNote = TextEditingController();
   late var _done = widget.taskToEdit?.done ?? false;
 
   @override
@@ -30,6 +31,7 @@ class _DialogState extends State<_Dialog> {
           mainAxisSize: MainAxisSize.min,
           children: [
             _textInput(_name, "Name"),
+            _textInput(_attachmentNote, "Attachment Note (optional)"),
             _doneSwitch,
           ],
         ),
@@ -45,6 +47,8 @@ class _DialogState extends State<_Dialog> {
                 title: _name.text,
                 done: _done,
                 deleted: false,
+                // Pass the attachment note text if provided
+                attachment: _attachmentNote.text.isNotEmpty ? {"note": _attachmentNote.text} : null,
               );
               Navigator.of(context).pop(task);
             },

flutter_app/lib/main.dart

@@ -1,4 +1,5 @@
 import 'dart:io' show Platform;
+import 'dart:typed_data';
 
 import 'package:ditto_live/ditto_live.dart';
 import 'package:flutter/foundation.dart';
@@ -100,10 +101,24 @@ class _DittoExampleState extends State<DittoExample> {
     final task = await showAddTaskDialog(context);
     if (task == null) return;
 
+    Map<String, dynamic> taskJson = task.toJson();
+
+    // If the task has an attachment note, create a Ditto attachment
+    if (task.attachment != null && task.attachment!['note'] != null) {
+      final noteText = task.attachment!['note'] as String;
+      final noteBytes = Uint8List.fromList(noteText.codeUnits);
+
+      // Create attachment from the note bytes
+      final attachment = await _ditto!.store.newAttachment(noteBytes);
+
+      // Replace the placeholder with the actual attachment token
+      taskJson['attachment'] = attachment;
+    }
+
     // https://docs.ditto.live/sdk/latest/crud/create
     await _ditto!.store.execute(
       "INSERT INTO tasks DOCUMENTS (:task)",
-      arguments: {"task": task.toJson()},
+      arguments: {"task": taskJson},
     );
   }
 
@@ -112,6 +127,50 @@ class _DittoExampleState extends State<DittoExample> {
     await _ditto!.store.execute("EVICT FROM tasks WHERE true");
   }
 
+  Future<void> _showAttachment(Map<String, dynamic> attachmentToken) async {
+    // Show loading dialog
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (context) => const Center(child: CircularProgressIndicator()),
+    );
+
+    String? attachmentContent;
+
+    // Fetch the attachment using the Ditto attachment API
+    _ditto!.store.fetchAttachment(
+      attachmentToken,
+      (event) async {
+        if (event is AttachmentFetchEventCompleted) {
+          // Get the attachment data
+          final bytes = await event.attachment.data;
+          // Convert bytes back to string
+          attachmentContent = String.fromCharCodes(bytes);
+
+          // Close loading dialog
+          if (mounted) Navigator.of(context).pop();
+
+          // Show the attachment content in a dialog
+          if (mounted) {
+            showDialog(
+              context: context,
+              builder: (context) => AlertDialog(
+                title: const Text("Attachment Content"),
+                content: Text(attachmentContent ?? "No content"),
+                actions: [
+                  TextButton(
+                    onPressed: () => Navigator.of(context).pop(),
+                    child: const Text("Close"),
+                  ),
+                ],
+              ),
+            );
+          }
+        }
+      },
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     if (_ditto == null) return _loading;
@@ -207,6 +266,20 @@ class _DittoExampleState extends State<DittoExample> {
         secondaryBackground: _dismissibleBackground(false),
         child: CheckboxListTile(
           title: Text(task.title),
+          subtitle: task.attachment != null
+              ? Row(
+                  children: [
+                    const Icon(Icons.attachment, size: 16),
+                    const SizedBox(width: 4),
+                    Expanded(
+                      child: TextButton(
+                        onPressed: () => _showAttachment(task.attachment!),
+                        child: const Text("View Attachment"),
+                      ),
+                    ),
+                  ],
+                )
+              : null,
           value: task.done,
           onChanged: (value) => _ditto!.store.execute(
             "UPDATE tasks SET done = $value WHERE _id = '${task.id}'",

flutter_app/lib/task.dart

@@ -9,12 +9,15 @@ class Task {
   final String title;
   final bool done;
   final bool deleted;
+  @JsonKey(includeIfNull: false)
+  final Map<String, dynamic>? attachment;
 
   const Task({
     this.id,
     required this.title,
     required this.done,
     required this.deleted,
+    this.attachment,
   });
 
   factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);

flutter_app/lib/task.g.dart

@@ -8,5 +8,7 @@
 	<true/>
 	<key>com.apple.security.network.server</key>
 	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
 </dict>
 </plist>

flutter_app/macos/Runner/DebugProfile.entitlements

@@ -28,5 +28,13 @@
 	<string>MainMenu</string>
 	<key>NSPrincipalClass</key>
 	<string>NSApplication</string>
+	<key>NSBluetoothAlwaysUsageDescription</key>
+	<string>Uses Bluetooth to connect and sync with nearby devices.</string>
+	<key>NSLocalNetworkUsageDescription</key>
+	<string>Uses WiFi to connect and sync with nearby devices.</string>
+	<key>NSBonjourServices</key>
+	<array>
+		<string>_http-alt._tcp.</string>
+	</array>
 </dict>
 </plist>

flutter_app/macos/Runner/Info.plist

@@ -4,5 +4,9 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+	<key>com.apple.security.network.server</key>
+	<true/>
 </dict>
 </plist>