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

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;
+  };
+}