TF-4268 Refactor app runner: split web/mobile runners, add platform error handlers

lib/main/app_runner.dart

@@ -1,49 +0,0 @@
-import 'dart:async';
-
-import 'package:core/utils/app_logger.dart';
-import 'package:core/utils/sentry/sentry_manager.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
-import 'package:sentry_flutter/sentry_flutter.dart';
-import 'package:tmail_ui_user/main.dart';
-import 'package:tmail_ui_user/main/main_entry.dart';
-
-Future<void> runAppWithMonitoring(Future<void> Function() runTmail) async {
-  await runZonedGuarded(() async {
-    WidgetsFlutterBinding.ensureInitialized();
-
-    // Handling Flutter UI and Build Errors
-    FlutterError.onError = (details) async {
-      logError(
-        'FlutterError: ${details.exception}',
-        exception: details.exception,
-        stackTrace: details.stack,
-      );
-      FlutterError.presentError(details);
-    };
-
-    // Handling Uncaught and Platform-Specific Errors
-    PlatformDispatcher.instance.onError = (error, stack) {
-      logError(
-        'PlatformDispatcher: Error: $error',
-        exception: error,
-        stackTrace: stack,
-      );
-      return true;
-    };
-
-    await SentryManager.instance.initialize(
-      appRunner: () async {
-        await runTmailPreload();
-        runApp(SentryWidget(child: const TMailApp()));
-      },
-      fallBackRunner: runTmail,
-    );
-  }, (error, stack) async {
-    logError(
-      'Uncaught zone error: $error',
-      exception: error,
-      stackTrace: stack,
-    );
-  });
-}

lib/main/main_entry.dart

@@ -1,6 +1,5 @@
 import 'package:core/presentation/utils/theme_utils.dart';
 import 'package:core/utils/build_utils.dart';
-import 'package:core/utils/config/env_loader.dart';
 import 'package:core/utils/platform_info.dart';
 import 'package:flutter/widgets.dart';
 import 'package:get/get.dart';
@@ -23,7 +22,6 @@ Future<void> runTmailPreload() async {
   await Future.wait([
     MainBindings().dependencies(),
     HiveCacheConfig.instance.setUp(),
-    EnvLoader.loadEnvFile(),
     if (PlatformInfo.isWeb) AssetPreloader.preloadHtmlEditorAssets(),
   ], eagerError: false);
 

lib/main/runner/app_error_handlers.dart

@@ -0,0 +1,30 @@
+import 'dart:ui';
+
+import 'package:core/utils/app_logger.dart';
+import 'package:core/utils/build_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Configures global error handlers for both Flutter framework and Platform dispatcher.
+void setupErrorHooks() {
+  // Handle Flutter Framework Errors (Rendering, Build, Layout, etc.)
+  FlutterError.onError = (details) {
+    logError(
+      'FlutterError: ${details.exception}',
+      exception: details.exception,
+      stackTrace: details.stack,
+    );
+    // Show the "Red Screen of Death" in debug mode.
+    FlutterError.presentError(details);
+  };
+
+  // Handle Asynchronous Errors (Futures, Streams, Platform Channels)
+  PlatformDispatcher.instance.onError = (error, stack) {
+    logError(
+      'PlatformDispatcherError: $error',
+      exception: error,
+      stackTrace: stack,
+    );
+    // Return true in release to prevent crashes; false in debug to surface errors.
+    return BuildUtils.isReleaseMode;
+  };
+}

lib/main/runner/app_runner_base.dart

@@ -0,0 +1,12 @@
+import 'dart:async';
+
+import 'package:sentry_flutter/sentry_flutter.dart';
+import 'package:tmail_ui_user/main/runner/app_error_handlers.dart';
+
+Future<void> runAppGuarded(Future<void> Function() runner) async {
+  SentryWidgetsFlutterBinding.ensureInitialized();
+
+  setupErrorHooks();
+
+  await runner();
+}

lib/main/runner/app_runner_mobile.dart

@@ -0,0 +1,10 @@
+import 'package:core/utils/config/env_loader.dart';
+import 'package:tmail_ui_user/main/runner/app_runner_base.dart';
+
+Future<void> runAppWithMonitoring(Future<void> Function() runTmail) async {
+  await runAppGuarded(() async {
+    await EnvLoader.loadEnvFile();
+
+    await runTmail();
+  });
+}

lib/main/runner/app_runner_web.dart

@@ -0,0 +1,21 @@
+import 'package:core/utils/config/env_loader.dart';
+import 'package:flutter/material.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+import 'package:tmail_ui_user/main.dart';
+import 'package:tmail_ui_user/main/main_entry.dart';
+import 'package:core/utils/sentry/sentry_manager.dart';
+import 'package:tmail_ui_user/main/runner/app_runner_base.dart';
+
+Future<void> runAppWithMonitoring(Future<void> Function() runTmail) async {
+  await runAppGuarded(() async {
+    await EnvLoader.loadEnvFile();
+
+    await SentryManager.instance.initialize(
+      appRunner: () async {
+        await runTmailPreload();
+        runApp(SentryWidget(child: const TMailApp()));
+      },
+      fallBackRunner: runTmail,
+    );
+  });
+}