refactor(apps): converge error-handlers notification shape in deno-runtime

Emit the same JSON-RPC notification shape node-runtime uses for
uncaught errors: method is the origin ('uncaughtException' /
'unhandledRejection') and params is [error.stack || error], instead of
the richer { type, message, filename, ... } / { type, reason, timestamp }
objects. The addEventListener registration mechanism stays as the
remaining genuine platform difference.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: d-gubert

packages/apps/deno-runtime/error-handlers.ts

@@ -3,27 +3,22 @@ import * as Messenger from './lib/messenger';
 export function unhandledRejectionListener(event: PromiseRejectionEvent) {
 	event.preventDefault();
 
-	const { type, reason } = event;
+	const error = event.reason;
 
 	Messenger.sendNotification({
 		method: 'unhandledRejection',
-		params: [
-			{
-				type,
-				reason: reason instanceof Error ? reason.message : reason,
-				timestamp: new Date(),
-			},
-		],
+		params: [error?.stack || error],
 	});
 }
 
 export function unhandledExceptionListener(event: ErrorEvent) {
 	event.preventDefault();
 
-	const { type, message, filename, lineno, colno } = event;
+	const error = event.error;
+
 	Messenger.sendNotification({
 		method: 'uncaughtException',
-		params: [{ type, message, filename, lineno, colno }],
+		params: [error?.stack || error],
 	});
 }