Initial commit: RustDesk 1.4.7 macOS desktop port

- Filled empty libs/hbb_common/ submodule (cloned from rustdesk/hbb_common)
- Patched Flutter 3.44 / Dart 3.12 compatibility:
  * flutter/lib/generated_bridge.dart: asTypedList with cast<>, DartPort=Int64
  * flutter/lib/common.dart: DialogTheme->DialogThemeData, TabBarTheme->TabBarThemeData
  * flutter/pubspec.yaml: extended_text 14.0.0->15.0.2, google_fonts override 5.0.0
  * flutter/macos/Runner/Configs/Release.xcconfig: EXCLUDED_ARCHS=x86_64
- Build verified: cargo check + cargo build --features flutter + cargo build --release --features flutter
- Verified flutter build macos --debug and --release both produce working .app
- Verified .dmg installer (27MB arm64) created via hdiutil
- Build deps: Xcode 26.5, CocoaPods 1.16.2, Flutter 3.44, VCPKG arm64-osx

flutter/lib/common/widgets/connection_page_title.dart

@@ -0,0 +1,38 @@
+import 'package:auto_size_text/auto_size_text.dart';
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+import '../../common.dart';
+
+Widget getConnectionPageTitle(BuildContext context, bool isWeb) {
+  return Row(
+    children: [
+      Expanded(
+          child: Row(
+        children: [
+          AutoSizeText(
+            translate('Control Remote Desktop'),
+            maxLines: 1,
+            style: Theme.of(context)
+                .textTheme
+                .titleLarge
+                ?.merge(TextStyle(height: 1)),
+          ).marginOnly(right: 4),
+          Tooltip(
+            waitDuration: Duration(milliseconds: 300),
+            message: translate(isWeb ? "web_id_input_tip" : "id_input_tip"),
+            child: Icon(
+              Icons.help_outline_outlined,
+              size: 16,
+              color: Theme.of(context)
+                  .textTheme
+                  .titleLarge
+                  ?.color
+                  ?.withOpacity(0.5),
+            ),
+          ),
+        ],
+      )),
+    ],
+  );
+}